RECORD- BREAKING 19 students earn Ph.D.s in 2018 See Pages 3, 19

{ { Fall 2018 MathA publication of the Department of Mathematics News at the University of Nebraska–Lincoln Peterson reaches 50 years at UNL

our faculty members earned 50-year Service Awards Ffrom the University of Nebraska–Lincoln in 2018. One was the math department’s own Allan Peterson. Peterson joined fellow Professors Edward Becker, Roger Bruning, and Brett Ratcliffe in receiving the award from Chancellor Ronnie Green in September. Peterson also was recognized at the Department’s April reception. Peterson has taught 51 years without interruption — he has never taken a sabbatical since he arrived in 1968, because he loves teaching so much. “In the history of the math department, I’ve taught more than anybody,” Peterson added. However, he plans to retire at the end of 2018-2019 academic year for health reasons. Peterson was diagnosed LINDSAY AUGUSTYN/UNL CSMCE with prostate cancer three years ago. Allan Peterson accepts a gift from the Department and Chair See PETERSON on Page 10 Tom Marley (left) at the April 2018 recognition reception.

Peterson’s achievements, as well delivered a campaign speech on UNL’s as his completion of 50 years as a campus in advance of the Nebraska VIEW FROM THE faculty member, are nothing short of primary. This anecdote brought home remarkable. He has published over to me that Al’s tenure has covered 200 research articles, supervised 32 some truly fascinating times and seen CHAIR Ph.D. students, and consistently been many changes. However, through it regarded as one of the top teachers in all, Al has been a steady beacon for Tom Marley the Department for five decades. In excellence in research and teaching chatting with Al about his early days and a role model for our faculty. t has been a year of records at Nebraska, I was reminded that his The Department also hit a new

Ifor the Nebraska Department job interview in 1968 took place on milestone by graduating 19 Ph.D.s

of Mathematics. Professor Al the same day that Bobby Kennedy See CHAIR on Page 8 DEPARTMENT NEWS: FACULTY NEWS: Hermiller ALUMNI NEWS: Bors { Two Rowlee lectures named AMS Fellow, Walker retires from U.S. Strategic hosted this year Page 4 an AWM Fellow Page 11 Command Page 14 { INSIDE: www.math.unl.edu/friends Fall 2018 1 {Research News Larios streamlines turbulence models f you have ever looked up at the the initial state of a Richardson’s careful calculations were Iclouds and marveled at their fluid, the equations incorrect by two orders of magnitude seemingly unlimited complexity, or choreograph the for a six-hour forecast. watched the cream in a cup of coffee motion of the fluid. To get around these difficulties, spiral into ever more intricate patterns Imagine trying modern researchers use a class of until it diffuses into a brownish haze, to predict how a techniques known as data assimilation. then you have glimpsed the strange particular dance Data assimilation eliminates the need and chaotic world of turbulence. would progress, for complete initial data. It instead Turbulence is nearly ubiquitous given only the incorporates incoming data into in science as well as everyday life, Adam Larios starting positions simulations by asking the simulated appearing in diverse areas such of the dancers, and solution to strike a balance between as weather prediction, aerospace a description of the choreography. For following the rules of the dynamical technology, and blood flow in the a slow simple dance, we might have system, and staying close to the heart. Understanding, quantifying, and some luck, but to bring the analogy observed data. It is as if, in trying to predicting turbulence have become closer to turbulence, imagine a fast, predict the outcome of our billion extremely important, yet elusive goals highly chaotic dance involving billions chaotic dancers, we had livestreaming in science and engineering. of dancers. Also imagine that the video cameras set up in several On a mathematical level, turbulent choreography is only a list of local locations to get an idea of the current fluids (including air and gasses) are rules for how dancers should interact state of the dance as it progressed. thought to be governed by the Navier- with their nearest neighbors. Such a This data could be fed into a computer Stokes equations, a system of partial dance might take on wildly complex, running a simulation that knows differential equations (PDEs) that is large-scale patterns that would be the local rules, but was started with simple to write down, but is so difficult nearly impossible to predict and inaccurate initial data. to work with that, in 2000, the Clay may be highly dependent on starting Classic data assimilation is based Mathematics Institute issued a $1 positions. In turbulent fluids, the local on a set of techniques known as the million prize to show mathematically rules are given by the Navier-Stokes Kalman filter. However, the Kalman whether the solutions remain physically equations, and the large-scale patterns filter is computationally expensive to realistic for all times. This problem has are things like hurricanes, solar storms, compute and limited in what it can been open since the work of Jean Leray or rapidly varying ocean currents. be applied to. In a 2014 paper by A. in 1932. Nevertheless, the effort to find Although the Navier-Stokes Azouani, E. Olson, and E. Titi, a new accurate, practical tools for predicting equations are hard, there is an even approach was proposed (now called the turbulence continues. The research of more fundamental difficulty: In real AOT algorithm). The idea abandons Assistant Professor Adam Larios has life, one typically does not fully know the expensive statistical methods of helped to further this effort. the initial condition. For example, in the Kalman filter and instead uses a To describe Dr. Larios’ work, we weather prediction, the current state feedback-control term at the PDE level. need to understand the notion of a of the weather is measured at locations This new approach is far less expensive dynamical system. A dynamical system spaced apart by roughly 1 kilometer and was mathematically proven to consists of a starting condition and on average, but the Navier-Stokes force the simulation to converge to the some laws that describe how things equations require initial data at every true solution exponentially quickly in change in time. Picture a group of location in space, down to roughly time. This paper set off a storm in the dancers just before the dance starts, millimeter scales. One option is to research world, with over 30 papers frozen in their starting positions. In interpolate the data, e.g., by assuming based on the AOT algorithm coming a dynamical system, this is known as the data vary linearly in between out in the last four years. the initial condition. Suddenly, the weather stations, but such a scheme Larios’ recent research has music starts, the scene comes to life, introduces a tremendous amount proposed several modifications to and the dance progresses according of error into the initial condition, the AOT algorithm. The first was a to its internal choreography. This which then grows exponentially fast nonlinear version of the algorithm, choreography is analogous to the in time due to the system’s underling which resulted in super-exponential governing laws of the dynamical chaos. Such an idea was tried by convergence rates. In 2017, Larios system. The Navier-Stokes equations mathematician Lewis Fry Richardson was awarded an individual investi- of fluids are a dynamical system in 1922, in the first-ever attempt gator grant by the National Science governing the motion of fluids. Given at numerical weather forecasting. See RESEARCH on Page 6

2 Fall 2018 www.math.unl.edu/give

3 2018 Fall www.math.unl.edu/friends

Donsig said. Donsig on Page 19 Page on See 7 Page on See DEGREES POUND

cake that make these changes possible,” possible,” changes these make that cake

” Tyler said. “It is easier for for easier is “It said. Tyler ” , material the

Research Fellowship in hand. hand. in Fellowship Research “Classrooms are the icing on the the on icing the are “Classrooms

and eager to work with each other on on other each with work to eager and

National Science Foundation Graduate Graduate Foundation Science National meetings. meetings.

significantly more involved in the work work the in involved more significantly arrived at UNL with a prestigious prestigious a with UNL at arrived

setting up weekly recitation leader leader recitation weekly up setting

“My students this semester are are semester this students “My Jessica De Silva and Jessie Jamieson, Jamieson, Jessie and Silva De Jessica

preparing lessons for instructors, and and instructors, for lessons preparing

work as they go. go. they as work University. Two of this year’s Ph.D.s, Ph.D.s, year’s this of Two University.

course packets, extending class time, time, class extending packets, course

makes it easier for them to show their their show to them for easier it makes member at Virginia Commonwealth Commonwealth Virginia at member

Other changes include putting together together putting include changes Other

Miller is now a tenure-track faculty faculty tenure-track a now is Miller having whiteboards on every wall wall every on whiteboards having

teach Calc recitations,” Donsig said. said. Donsig recitations,” Calc teach

is in mathematics education. Dr. Dr. education. mathematics in is and learn from one another, and and another, one from learn and

larger effort to change the way we we way the change to effort larger

first Ph.D. graduate whose research research whose graduate Ph.D. first tables prompt students to collaborate collaborate to students prompt tables

The renovations are “part of a a of “part are renovations The

Miller became the Department’s Department’s the became Miller

yler said the new six-person six-person new the said yler T renovated last year. year. last renovated

Another first is that Erica Erica that is first Another

of the entire class. class. entire the of new classrooms when CBA was being being was CBA when classrooms new

new Ph.D.s are international students. students. international are Ph.D.s new

groups and sharing their work in front front in work their sharing and groups Donsig submitted a proposal for the the for proposal a submitted Donsig

discipline where approximately 50% of of 50% approximately where discipline

hindered the students from working in in working from students the hindered Professor and Vice Chair Allan Allan Chair Vice and Professor

foreign country, which is unique for a a for unique is which country, foreign

traditional classroom, which she said said she which classroom, traditional students, which encourage discussion. encourage which students,

from 14 different states and one one and states different 14 from

renovations. Last year, she taught in a a in taught she year, Last renovations. and oval tables for groups of six six of groups for tables oval and

are successful. The new Ph.D.s come come Ph.D.s new The successful. are

attendance, which she credits to these these to credits she which attendance, cameras, whiteboards on every wall, wall, every on whiteboards cameras,

place where female graduate students students graduate female where place

and has seen a dramatic increase in in increase dramatic a seen has and now feature projectors, document document projectors, feature now

Department’s reputation as being a a being as reputation Department’s

five semesters semesters five teaching recitations for for recitations teaching rows of desks facing one instructor instructor one facing desks of rows

Ph.D.s are women, and continues the the continues and women, are Ph.D.s

yler (see Page 17) has been been has 17) Page (see yler T Elizabeth Classrooms that used to look like like look to used that Classrooms

nationally, only about 26% of new new of 26% about only nationally,

secondary math education major major education math secondary student collaboration. student

compares well with the fact that, that, fact the with well compares

Undergraduate math and and math Undergraduate learning classrooms to allow for more more for allow to classrooms learning

of the class is female (10). This This (10). female is class the of

more attention. attention. more

Pound Hall (formerly CBA) into active active into CBA) (formerly Hall Pound

in several ways. First, the majority majority the First, ways. several in

she can, which helps her students pay pay students her helps which can, she

transformed five rooms in Louise Louise in rooms five transformed

The 2018 Ph.D. class is unusual unusual is class Ph.D. 2018 The

boards in the classrooms as much as as much as classrooms the in boards

renovations, the Math Department Department Math the renovations,

set in 2015. 2015. in set

the interactive features of the new new the of features interactive the

positive feedback from the Brace Labs Labs Brace the from feedback positive

breaking the record of 15, which was was which 15, of record the breaking

for more than 15 years, said she uses uses she said years, 15 than more for II) students this semester. Based on the on Based semester. this students II)

T Ph.D.s ever awarded in one year, year, one in awarded ever Ph.D.s

taught a range of introductory courses courses introductory of range a taught Math 106 and 107 (Calculus I and I (Calculus 107 and 106 Math

of Mathematics. This was the most most the was This Mathematics. of

y Emer Janet Lecturer hings are looking different for for different looking are hings , who has has who ,

earned a Ph.D. from the Department Department the from Ph.D. a earned

19 outstanding graduate students students graduate outstanding 19

Calculus classrooms Calculus

history with 2018, a year in which which in year a 2018, with history

Department’s early doctoral education education doctoral early Department’s

It is interesting to contrast the the contrast to interesting is It

Renovations add new add Renovations

Department’s 19th Ph.D. 19th Department’s

awarded four Ph.D.s, including the the including Ph.D.s, four awarded

a banner year as the Department Department the as year banner a

mathematics. That year, 1963, was was 1963, year, That mathematics.

the first woman to earn a Ph.D. in in Ph.D. a earn to woman first the

years for Mildred Gross to become become to Gross Mildred for years

MATHEMATICS

10th Ph.D. in mathematics and 65 65 and mathematics in Ph.D. 10th

become the mathematics department’s department’s mathematics the become

55 years for Clinton Burke Gass to to Gass Burke Clinton for years 55

University of Nebraska. It would take take would It Nebraska. of University

Ph.D. in mathematics awarded by the the by awarded mathematics in Ph.D.

2

Albert Candy earned the first first the earned Candy Albert

018 marks the 120th year since year 120th the marks 018

with many firsts many with

breaks records records breaks 2018 Ph.D. class class Ph.D. 2018

{ News Department Department News ROWLEE LECTURES { Games and entropy isiting professor in the Nebraska Born in Brazil, Exel studied at VDepartment of Mathematics the University of São Paulo, where he Ruy Exel, emeritus professor of earned both his bachelor’s and master’s mathematics at the Federal University degrees. He completed his Ph.D. in of Santa Catarina, in Florianòpolis, 1985 from the University of Califor- Brazil, gave the second of two Rowlee nia, Berkeley under the supervision lectures in 2018, on Nov. 2. of Marc Rieffel and then conducted His area of research is operator postdoctoral research in Warwick algebras with applications to (England) and Canberra (Australia). dynamical systems, statistical Exel’s work in operator algebras LINDSAY AUGUSTYN/UNL CSMCE mechanics, semigroups, and K-theory. is closely related to work being Professor Dave Benson began his Rowlee Exel’s Rowlee Lecture, “Twenty done by Nebraska Professors Allan Lecture with examples of symmetry Questions, Mastermind and Entropy,’’ Donsig and David Pitts. Exel and occurring in nature, art, architecture, dealt with the problem of measuring Pitts have been working on analysis music, and even grade-school arithmetic. the value of information. Here’s and synthesis for operator algebras, the idea: Consider a game played similar to what is done in Fourier by Alice and Bob. The game has analysis, but for certain classes of Exploring a table on which is placed a large linear operators instead. (Roughly number of objects of different speaking, analysis is the problem of symmetry colors, shapes, weights, sizes, flavors, deciding what “frequencies” are in an smells, etc. Alice thinks of one of algebra, and synthesis is the problem the objects and challenges Bob to of reconstructing an algebra from the in math guess it. Bob is allowed to ask Alice frequencies it contains.) a series of questions about one of the Exel’s other professional rofessor Dave Benson, the 6th characteristics of the object (e.g., the appointments include the University Century Chair of Mathematics P object’s color, shape, or which side of São Paulo and the University of (Emeritus) at the University of of the table it is located). The game New Mexico, and he has taught mini- Aberdeen in Scotland, delivered the continues until Bob finally guesses courses in Lisbon, Madrid, Ottawa, 21st annual Howard Rowlee Lecture, Alice’s object. Which characteristic and New Zealand. He is a member of “Symmetry in Mathematics,” on April should Bob ask about first? If all the World Academy of Sciences and 27, 2018. objects are white, except for a red one, the Brazilian Academy of Sciences, as Benson received his Ph.D. from is it a good strategy for Bob to start by well as a Commander of the National Cambridge University under the asking which color it is? If Bob gets red Order of Scientific Merit in Brazil. direction of John Thompson. as an answer, Bob wins the game, but Exel also was a plenary speaker at Early in his career, Benson was it is much more likely Alice will say the Latin American Congress of involved in the famed classification of white, and Bob is back to square one. Mathematics in 2016 and an invited finite simple groups. His thesis gave the Exel’s lecture gave a precise way to speaker at the International Congress first non-computer-assisted proof that measure the value of the information of Mathematicians in 2018. the sporadic group J is simple. Since 4 obtained by each of Bob’s questions. - David Pitts } then, Benson has published extensively in a wide range of mathematics. He Professor Ruy has nearly 150 publications to his Exel throws the name, including a popular two-volume non-regular die he manuscript on representation theory made for his Nov. and cohomology. Benson is also the 2, 2018, Rowlee author of “Music: A Mathematical Lecture titled Offering,” a 500-page treatise on the “Twenty Questions, mathematics of music, including Mastermind, and applications of groups to music theory. Entropy” for a In recent years, Benson has co- demonstration of authored with Iyengar and Krause entropy. (later joined by Pevtsova) an influential series of 12 papers with the goal of

LINDSAY AUGUSTYN/ See BENSON on Page 6 UNL CSMCE

4 Fall 2018 www.math.unl.edu/give Department News { PI MU EPSILON LECTURE Reformulation of multivariable calculus obert Ghrist of the University Rof Pennsylvania gave the 12th annual Pi Mu Epsilon address “A New Look at an Old Calculus” on Oct. 19, 2018, following the induction of 17 new undergraduate members into the Nebraska Alpha chapter of Pi Mu Epsilon. One important objective of the Pi Mu Epsilon lecture series is to provide an opportunity for math major undergraduates to meet a distinguished professor from another university who can provide a glimpse into the interesting problems and PHOTOS BY STEPHANIE VENDETTI/UNL CSMCE projects they are working on. Seventeen students were inducted into the Nebraska Alpha Chapter of Pi Mu Epsilon Ghrist, Andrea Mitchell (PME) on Oct. 19, 2018. Back row, left to right: Alexandra Seceleanu (PME faculty advisor), Laurel Lund, Addison Waller, Alex Schroeck, Savannah Howard, Michael University Professor in Mathematics Schneider, Shannyn Bird (PME chapter president), Lara Quiring, Victoria Salinas, and Electrical/Systems Engineering, Miles Davis, Manying Wang, Qianyu Dong, Luke Diego Galvan, Ge (Grace) Chai, argued that calculus instruction can Robert Ghrist (PME lecturer), Alessandro De Stefani (Math Club faculty advisor); be reformulated to not only raise the front row: Mia Nguyen, Alex Heitzmann, Luis Tuarez, Thuan Luong. level of mathematics students see in multivariable calculus, but also make Ghrist’s text also includes a “baby” the course more relevant to honest version of differential forms on top applications that students care about of the standard concepts of vector today. calculus such as curl and divergence, Ghrist discussed his frustrations giving students a taste of things to with current Calculus content and come should they take higher-level the mode of visualization, which he math courses. believes has not kept up with inno- “There are lots of ways to teach vation. A brief sampling of calculus calculus, and there are lots of good textbooks used at most universities ways to teach calculus,” Ghrist said. revealed that the content covered has “My goal is to put up a bunch of not changed much over the years. resources that students can use, that Chalk, blackboard, paper, and pencil anybody can use in order to make have remained the enduring standard their class a little more interesting and of classroom instruction. Professor of Mathematics and Electrical potentially transformative.” “I’m not a big fan of LaTeX fonts, Engineering Robert Ghrist of the Ghrist was awarded the 2013 and I’m not a big fan of plotting vector University of Pennsylvania delivers the Chauvenet Prize for “Barcodes: The fields,” Ghrist said. “So much of the 12th annual Pi Mu Epsilon address. Persistent Topology of Data” and the notation is a holdover from early 20th 2014 Gauss Lectureship of the German century physics and doesn’t fit the way for the rest of the course, particularly Mathematical Society. He also received we as mathematicians do things.” as it applies to the visualization and a Presidential Early Career Award in Ghrist shared his own solutions manipulation of data. This higher- 2002. Ghrist is known for his work to these issues by exploring and dimensionality is illustrated through on topological methods in applied summarizing his new multivariable applications such as the kinematics mathematics, specifically for applying calculus text, “Calculus Blue.” Both of robots, wireless signals, machine topology to data analysis and to the the e-text and supplementary visual learning and artificial intelligence. study of sensor networks. “v-text” on YouTube are presented in Ghrist’s text teaches derivatives The Nebraska Alpha chapter high-definition comic-book style. as linear transformations that are is currently celebrating its 90th The text is different not only motivated by applications such anniversary and is supported by the in format, but also in content. It as game theory, particularly Nash Department of Mathematics and the introduces matrices and elementary equilibrium. Double and triple National Science Foundation. linear algebra as foundational material integrals appear later in great detail. - Miles Davis } www.math.unl.edu/friends Fall 2018 5 Department News Math debuts free open-resource textbook ith an established environment received support from the Open but also pre-intermediate algebra level {Wfor supporting active learning, Education Resources Kelly Grant, mathematics). the Department of Mathematics is along with internal Department of The highlight of the interactivity, infusing active learning into its first- Mathematics support. Taran Funk, however, is the inclusion of wholly year courses, from administrative Ariel Setniker, Karina Uhing, and interactive graphs developed by new structures to curriculum resources. Nathan Wakefield collated, edited, and Assistant Professor of Practice Joshua Part of this path to implement wrote materials to form a textbook Brummer, where users can drag active learning includes supplementing covering Intermediate Algebra, College points and lines around to solidify the Department’s courses with an Algebra, and College Trigonometry. connections between the text and open educational resource (OER), Using the PreTeXt authoring system, the visual. Additionally, the team is a digitized resource freely open to the team placed the OER on the working to integrate these dynamic students, teachers, and self-learners department server, opening the text to manipulatives with the WeBWorK that encourages engagement. be accessible to anyone worldwide. online homework system. An OER is fundamentally live, A high-quality OER calls for An OER is fundamentally a live meaning that once it is developed, strong interactivity, which necessitates resource that undergoes continual it will not sit static like a textbook. student engagement rather than a Rather, it will go through a continual passive read. In all sections of the improvements. The department cycle of feedback and updates, current version of the OER, students took an important step in providing always staying current. Further, the have opportunities to interact as they students with a free resource for Department’s OER is completely free work through a topic. This ranges learning mathematics with this initial to everyone, ultimately saving students from required clicks to see sequential project. Future steps will improve up to $150 a term and allowing a parts of a worked-out example to functionality and seek to provide more equitable experience in the being able to link back to previously students rich, open opportunities to mathematics classroom. learned knowledge immediately learn mathematics. During the summer of 2018, within the OER (the OER combines - Ariel Setniker and Nathan Wakefield and Allan Donsig not only the courses mentioned prior, Nathan Wakefield}

Theory. Cayley is credited with being RESEARCH From Page 2 BENSON From Page 4 the first to formulate the axioms of a Foundation to develop nonlinear data putting the theory of modules and group, although the idea was present assimilation. This research involves representation theory on a new already in Gauss’ work. tools from functional analysis and foundation. Benson concluded his lecture topology as well as large-scale tests on Benson began his Rowlee Lecture by discussing more modern aspects the supercomputers at UNL’s Holland with examples of symmetry occurring of group theory and representation Computing Center. in nature, art, architecture, music, and theory. In particular, he discussed Recently, along with his Ph.D. stu- even grade-school arithmetic. For briefly Alperin’s Conjecture, which dent Collin Victor, Larios developed example, snowflakes often exhibit the predicts a relationship between the an AOT-method for moving measure- symmetries of the dihedral group with number of simple representations in ment devices, allowing measurements 12 elements, and tilings from buildings characteristic p of a finite group and its to come from sensors attached to in the Middle East in the 1400s exhibit p-subgroups. satellites, drones, or moving vehicles. even more exotic kinds of symmetry. Benson has given numerous He showed that allowing the sensors to In grade-school arithmetic, the talks at premier conferences over the move can result in an order of magni- procedure of addition of integers with years, including an invited talk at the tude reduction in the number of sen- a carry describes a 2-cocycle, and gives International Congress of Mathematics sors required, which could drastically a generator for the second cohomology in Hyderabad, India, in 2010. reduce equipment costs for scientists. group of the cyclic group of order 10. A single continent did not suffice In addition, along with his Ph.D. Benson proceeded to talk to honor the occasion of Benson’s 60th student Elizabeth Carlson and Dr. about symmetries in the history birthday: In 2015 and 2016, there were Joshua Hudson at the Johns Hopkins of mathematics, including the conferences in Vancouver, Canada, University Applied Physics Laboratory, work of Gauss, Cayley, and Galois. and on the Island of Skye in Scotland, Larios is developing AOT-based tech- For example, Galois exploited the both to commemorate his many niques for estimating the underlying symmetries enjoyed by the roots of a accomplishments. parameters of the dynamical system polynomial to prove that there is no In 2017, Benson was elected on-the-fly. These latest innovations formula for solving the general quintic as a Fellow of the Royal Society of will result in more robust simulations polynomial by radicals, and thereby Edinburgh. of turbulence. } launched what is now known as Galois - Mark Walker }

6 Fall 2018 www.math.unl.edu/give Department News {

CAREER PERSPECTIVES IN MATHEMATICS POUND From Page 3 students who are struggling a little bit Sposato: From UNL to Intel to get involved in this setting.” There are about 1,500 students ebraska alumna Tina Sposato yield department in Math 106 and 107 each fall and Ngave the fifth Career Perspectives as a staff engineer 1,000 each spring, and almost all of Lecture on March 8, 2018, highlighting for Intel’s new them are now using the active learning her journey from graduating with microprocessor fab, classrooms. a bachelor’s degree in mathematics which was built The university funded the in 1997 to earning a master’s degree to manufacture classroom renovations and furniture. in chemical engineering from Texas the next genera- “We appreciate the resources A&M University and now working at tion of computer committed by the university to active Intel Corporation as a staff engineer. processors. As a learning,” Donsig said. “Dedicated Sposato was hired straight from Tina Sposato yield integration classrooms are a major commitment.” graduate school into the highly engineer, she compares tools’ yield Success in mathematics is selective Rotational Engineers against each other at each operation highly correlated with retention and Program for Intel’s microprocessor fab of the manufacturing process, i.e. how graduation rates, he added. in Rio Rancho, New Mexico. the litho, etch, and films work together. “Very few people today make She went on to also work for She works directly with the process a great living sitting in a room by Intel’s development fabs in Santa Clara, engineers to improve the yield. themselves,” Donsig said. “Group California, and Portland, Oregon, Sposato also will be one of the work, interacting and explaining doing process development for the invited panelists at the Nebraska Con- material with peers is crucial and next generation of microprocessors ference for Undergraduate Women in builds skills for students, whatever or flash memory in the department of Mathematics in 2019. She is married to their careers may be.” lithography. She currently resides in a Husker alum and has two children, - Alli Davis and Phoenix, Arizona, and works for Intel’s Sarah and Thomas.} Lindsay Augustyn } Genocide survivor returns to share her story t the age of 13, Channy Chhi equality and the way she addressed ALaux was marched into Khmer discrimination in her career. Rouge labor camps at the start of the She also met with mathematics Cambodia genocide in 1975. students to talk about her own After surviving four years of experiences in math at the University horrific conditions and starvation and in her career. in the “Killing Fields,” Laux and While revisiting the horrors of her family were settled in Lincoln her youth often brought tears to Laux’s as refugees. Not knowing a word of eyes, she said sharing the story with English and after not being allowed young people is extremely important. to attend school since the sixth grade, “I feel really blessed to be here Lau felt overwhelmed entering a 10th- COURTESY PHOTO with an opportunity to give back, to grade classroom. Channy Chhi Laux (right) meets with show that even as a refugee, there But, through the kindness of mathematics students in Avery Hall. are ways to help people,” Laux said. strangers who became an extended Silicon Valley. While she flourished “Continuing to share my story is family, Laux graduated from Lincoln in the Golden State, Laux considered important to help people understand High School and went on to earn a Nebraska home and desired to give what we go through and to inspire bachelor’s degree in mathematics and back to the community that helped her them to decide how they want to shape computer science from the University family rebuild. the world.” of Nebraska-Lincoln. That feeling of gratitude brought Laux retired from engineering in “Lincoln was a second chance her back to campus April 18, 2018, 2010, when she committed to finishing at life,” she said. “When I came, I felt for a day of talking with students her book, “Short Hair Detention: everyone was ready for me and wanted about the Cambodian genocide and Memoirs of a 13-Year-Old Girl me to succeed.” the challenges she faced in a male- Surviving the Cambodian Genocide.” After college graduation, Laux dominated career field. The book was published in December moved to California and enjoyed She met with students in a 2017. a 30-year engineering career at women, gender, and science class – Deann Gayman, University various companies in California’s where she spoke about workplace Communications } www.math.unl.edu/friends Fall 2018 7 Department News {Thank you to our Donors Donations from 7/1/17-12/3/18 Rajendra B. Dahal, Ph.D. Lt. Col. James A. Okins Mr. Thomas Danaher Mr. Yuliy Pisetsky Chair’s Circle Mrs. and Mr. Lisa and Timothy Davis Ms. Amanda Potts (donors above $5,000) Drs. Matthew R. Dvorak and Rebecca Mr. Donald Pribil Mr. Brian T. Bares Norman Dvorak Ms. Julia Read-LaBelle and Mr. Peter Bares Family Foundation, Inc. ExxonMobil Foundation R. LaBelle Ms. Linda J. Bors Mr. Taylor Faulkner Mr. Jon Riecke Ms. Amy S. Bouska Mr. Jonathan Fisher Robert J. Schwabauer, Ph.D. Dr. W. James Lewis and Ms. Doris Dr. and Mrs. Gary and Constance Mrs. and Mrs. G. Neale and Laura Lewis Gilbert Shaner Mr. Richard P. Marshall, Jr. and Mrs. Dr. Gopi Shah Goda Mr. Bryan Siebler Mary E. Marshall Google, Inc. Drs. David and Muriel Skoug Mr. Conrad Rennemann, Jr. Gary F. Gruenhage, Ph.D. Ms. Mary E. Sommermeyer and Dr. Mrs. Marilyn Johnson Earl S. Kramer Friends Drs. Erica L. Johnson and Howard Mr. Christian Spaccarotella Mr. and Mrs. Ray Stevens, Jr. Mr. and Mrs. Mark and Kelly Allison Skogman Dr. Julia St. Goar AON Foundation Drs. Vesna and Zoran Kilibarda Mr. and Mrs. Travis and Angela Stiens Mrs. Tanya E. Baker and Mr. Alan Mrs. and Mr. Melissa and Jeffrey Mr. Nguyen P. Vu Baker Kosch Mrs. and Mr. Mary and Douglas Mr. Walter Bauman, Jr. Mrs. and Mr. Ann and Scott Liberman Dr. and Mrs. Jack L. Beal Steven P. Lindblad, Ph.D. Wadman Mr. Brad B. and Dr. Melissa R. Berta Mr. and Mrs. Ronald L. Machacek Drs. Judy L. and Mark E. Walker Dr. and Mrs. Monte Boisen, Jr. 2nd Lt. James C. Maciag Mr. Brian J. Wickman Dr. and Mrs. Dennis Bonge Dr. Joseph M. Mahaffy Drs. Roger A. and Sylvia M. Wiegand Dr. and Mrs. John E. Boyer Jr. Drs. Tom and Kate Marley Mr. Adam Wigington Ms. Virginia J. Brokaw Mr. and Mrs. Arthur and Susan Dr. Nora Youngs Dr. and Mrs. Karl E. Byleen Mastera Mr. and Mrs. Rodney and Susan Ms. Cassandra L. McKay Contributions to the math Chandler Ms. Carol McShane department funds can be made at Dr. Leo G. Chouinard II Drs. John C. and Glory L. Meakin http://www.math.unl.edu/give Dr. and Mrs. Aaron and Elizabeth Nike Employee Matching Gift or through the mail (see Page 15 Crabtree Dr. Ben C. Nolting for donation form).

cohort, Albert Candy received the first resonates 100 years later. CHAIR From Page 1 Ph.D. from our department in 1898. I am pleased to say that the Candy in a single calendar year, surpass- He would later become chair of the Fund is still thriving and continues to ing our previous high of 15 in 2015. Department from 1917-1934. Almost help support our graduate program, This tremendous accomplishment is a exactly 100 years ago, in a document illustrating the long-lasting impact of testament to our high-quality students dated February 15, 1919 (which such gifts. As chair, my principal goal (almost all of who landed impressive he notes as the 50th anniversary of is to support our students, faculty, and positions in academia, industry, and the University of Nebraska), Candy staff attain excellence in their teaching, government; see Pages 3 and 19) and established in his will the Candy learning, and scholarship. Thanks to faculty, as well as the many reforms our Mathematical Fellowships, 26 years the generosity of Albert Candy and department has implemented, which before his passing. He writes that he other donors over the years, I have have made our graduate program a does not desire to assist anyone “whose the means to say “yes” more often national model. Notably, it also occurs purpose is to get as much out of society than not when requested to support at a time when the size of our graduate as he can and give as little as possible a worthy project. (A case in point is faculty is at a modern-day low (cur- in return. Hence, I [Candy] wish that Michelle Homp’s productive trip to rently at 31, including faculty with full- everyone who accepts this Fellowship Senegal this past summer; see Page time administrative appointments). might feel under obligation to give 9.) Every donation is highly valued I also would like to mention an someone, in some way, at some time, and goes a long way to supporting our anniversary of sorts. As Jim Lewis at least as much as he receives from department’s mission. I wish all of you notes in his article on our latest Ph.D. this foundation.’’ This sentiment still a very happy holiday season. }

8 Fall 2018 www.math.unl.edu/give Faculty News { Connecting continents

Michelle Homp’s Journal

have been a faculty member at the IUniversity of Nebraska-Lincoln (Photo left) Michelle Homp (left) with Masake (Kane) Ly (far right), the Afrimath founder since 2005, serving both the Center and director. (Photo right) Students and counselors attending the Afrimath Summer Camp for Science, Mathematics and shared their experiences at the Dakar Forum on Mathematics and Education Forum. Computer Education (CSMCE) and the Department of Mathematics. A developed a friendship that led to our welcoming and generous. They pride significant portion of my role is to collaboration. themselves on being known as “the coordinate and teach graduate courses Afrimath consisted of a teacher country of teranga,” the Wolof term for K-12 teachers of mathematics program and a summer camp for hospitality. Everywhere I traveled, continuing their education or for middle school students and people went out of their way to offer working toward earning a master’s culminated in The Dakar Forum assistance or show me kindness. Even degree. One of UNL’s graduate on Mathematics and Education. Ly simple cultural traditions emphasize programs is called Primarily Math. provided the overall coordination the importance of hospitality, both It is a renowned and highly effective for the program and led the summer to guests and to fellow citizens. program for elementary teachers camp while I led the professional Each morning of the program, the (largely of primary grades) who wish development sessions for the teachers. students and teachers would gather to strengthen their mathematical Our plan is to train a small group of for an opening warm-up session in content and pedagogical knowledge teachers from SABS to become teacher an outdoor courtyard. Part of the while earning UNL’s designation as a leaders, who will in turn offer the daily routine was to clap and sing a K-3 Mathematics Specialist. Primarily Math experience to more traditional song that nearly everyone In July of this past summer, I had elementary teachers in Dakar. It is my in Senegal would have learned as a the privilege of traveling to Africa to hope that I can return to Dakar to help child. The song was about having introduce the Primarily Math program make this happen. pride in your community, whether to seven teachers from the Senegalese- I learned a lot about the people, that community is as small as your American Bilingual School (SABS) in the education system, and the culture class or as large as your country and Dakar, Senegal. This experience was of Senegal. While nearly all instruction how extending hospitality within one component of the 2018 Afrimath is provided in French, the “official” your community brings success and Summer Program. Headquartered language of Senegal, this is not the happiness to everyone. in Dakar, Afrimath is an initiative native language of the majority of the The most generous act of all, for designed to strengthen mathematics people. The language most commonly which I was a recipient, was when education in Senegal and all of Africa spoken in Senegalese homes is Wolof, I was given a Senegalese name. It by engaging students and teachers in and there are more than 30 additional is traditional for guests to be given rich learning experiences that deepen dialects spoken in other regions. the last name of their host family their knowledge of mathematics and Nearly every student attending school (more evidence of their hospitality), mathematics pedagogy. is a French-language learner while so my Senegalese surname already Afrimath founder and director, they are learning other subject matter, was “Kane” (pronounced kahn). To Masake (Kane) Ly, is a Senegalese which adds a layer of complexity determine a first name, the students native who was a high school math to mathematics education in the and teachers met privately to decide. teacher at SABS while she earned her elementary schools in Senegal. When the selection was made I was Master of Arts for Teachers degree It was interesting to see the ceremoniously led into the room and through UNL’s online program. I similarities and differences between given the name “Maty” (pronounced served as her online instructor for the traditional algorithms for the basic mah’ tee), so I now answer both to several courses, and she asked me to be operations used in Senegal and those Michelle and to Maty Kane. Nothing her advisor. Ly traveled to Nebraska to used in the U.S. could have made me feel more take a summer graduate course, and we The people of Senegal are welcome. } www.math.unl.edu/friends Fall 2018 9 Faculty News Graduate Students PETERSON From Page 1 “I always ask not to teach between 11:30 and 1 because I go to the Advised by Al Peterson Peterson said he is very proud YMCA and workout. For years it was James Spencer...... 1973 of his record number of citations in racquetball and now it’s power pump Dwight Sukup...... 1974 {the American Mathematical Society’s and cycling. I still go five days a week,” Darrell Hankerson...... 1986 MathSciNet database. Peterson said. Gerald Diaz...... 1989 “Overall, I’ve been cited 4,115 Peterson Timothy Peil...... 1990 times by 1,538 different authors,” chose to come to John Schneider...... 1992 Peterson said. “And of all the math Nebraska because Ferhan Atici...... 1995 books and math research publications, of Professor Lloyd Betty Harmsen...... 1995 in the year 2001, my book on time Jackson, one Michael Morelli...... 1996 Douglas Anderson...... 1997 scales, ‘Dynamic Equations on Time of the nation’s Richard Avery...... 1997 Scales,’ is the second-most cited.” leading scholars Robert Krueger...... 1998 Peterson, who has written eight in ordinary Elvan Akin...... 2000 books and more than 200 papers, was Allan Peterson differential Jo Hoffacker...... 2001 an assistant professor at Nebraska from equations. Peterson Kirsten Messer...... 2003 1968 to 1972, when he was promoted heard Jackson give several lectures at a Jennifer Langdon...... 2005 to associate professor with tenure. conference in 1967 and thought he was Bobbi Buchholz...... 2007 He became a full professor in 1976 “an excellent teacher.” Jacob Weiss...... 2007 and was awarded the Charles Bessey Peterson met several of Jackson’s Heidi Feller...... 2008 Professorship in 2006. In 1983, he also students at that conference, including Raegan Higgins...... 2008 Rajendra Dahal...... 2009 received a Distinguished Teaching Professor Emeritus Lynn Erbe. Chris Ahrendt...... 2010 Award. Over the years, Peterson has “I have known Al since we Michael Holm...... 2011 earned nine Recognition Awards for were both in Boulder, Colorado, Khulud Alyousef...... 2012 Contributions to Students at UNL; has in the summer of 1967, attending Christopher Goodrich...... 2012 served on the editorial board for 17 some special lectures given by John Tanner Auch...... 2013 journals; and has had two conferences Barrett, his Ph.D. supervisor from Pushp Awasthi...... 2013 held in his honor: one at UNL in 2013 the University of Tennessee, and Abigail Brackins...... 2014 and another in Novacella, Italy, in my supervisor, Lloyd Jackson, from Julia St. Goar...... 2016 August 2007. Nebraska,” Erbe said. “Al is well known Kevin Ahrendt...... 2017 Thirty-two doctoral students through his extensive research in Areeba Ikram...... 2018 Scott Gensler...... 2018 graduated with Peterson as their ordinary differential equations and his Wei Hu...... current advisor, and he has two current books on ODEs, difference equations, Ariel Setniker...... current students: Wei Hu and Ariel Setniker. and fractional difference equations. From 2001 to 2014, Peterson When Al arrived in Lincoln, he was mentored 51 REU students (Research very involved in continuing the Michelle Homp, now an Experiences for Undergraduates) and study of ODEs and teaching graduate assistant professor of practice in the one McNair Scholar, Raegan Higgins, courses using ideas and methods Department, shared one of Peterson’s who is now an associate professor in pioneered by Lloyd Jackson.” jokes: “My favorite is one where I the Department of Mathematics and For years, Peterson taught one initially didn’t realize he was telling Statistics at Texas Tech University. graduate course, usually in ODEs, a joke. It was near the end of our In 1997, 2002, and 2009, Peterson and one calculus course. For at least class period, and Al started talking was one of two main speakers at a decade, he taught a course called about applications of mathematics the University of Wyoming Rocky Honors Calculus, in which he covered to real-world phenomena. One such Mountain Mathematics Consortium all three sections of Calculus in two connection was how bifurcations were Summer Conference, where he gave semesters. believed to be related to the patterns 10 75-minute lectures. He is one of He is also well known on campus observed in leopard spots. For his only two mathematicians who have because of the jokes he tells in his final example, he asked with a straight co-coordinated this conference three lectures, Erbe said. face, ‘And have you noticed when you times. “I used to tell jokes at the see birds migrating in a V-shape that Besides the starting salaries (his beginning, but now I tell a joke at one side is always longer than the was $10,500 in 1968), Peterson said the end of every class,” Peterson other? Do you know why that is?’ We the main differences between the said. “I was teaching Math 104 one paused in expectation of a complicated Department 50 years ago and now are semester, and I was telling the joke at mathematical explanation. And then the number of people doing research the beginning of the period. But what Al said, ‘Because there are more birds and the emphasis placed on teaching happened was, I would tell the joke on one side.’” evaluations. What hasn’t changed since and then about six people would get Peterson has fond memories of his he arrived is his Differential Equations up and leave. So I said, ‘I’m not telling students, especially his Ph.D. students. Seminar on Tuesdays and Thursdays — the joke at the beginning of the period “A lot of my Ph.D. students call me and not teaching over the lunch hour. any m ore .’” Dad,” Peterson said, smiling.

10 Fall 2018 www.math.unl.edu/give Faculty News { Johnny Henderson, Distinguished Professor of Mathematics at Baylor Hermiller joins AMS Fellows University, who was advised by Lloyd group theory focuses on the study of Jackson, relayed this story: “After usan Hermiller of the University of Nebraska-Lincoln Department of algorithmic, growth, and homological I had accepted an offer to join the S Mathematics has been named a fellow properties of groups, as well as faculty at the University of Missouri applications to low dimensional at Rolla for the 1981-1982 academic of the American Mathematical Society. topology and computational algebra. year, I had to wait for UNL’s July Hermiller, In much of her research, she finds 1981 commencement for my Ph.D. Willa Cather large classes of groups for which to be awarded. A few weeks after Professor of Math- algorithmic problems have particularly commencement, I was in Al’s office, of ematics, has joined tractable solutions, and she uses course reading the sports section of his the esteemed group geometric properties to obtain bounds newspaper, and Al just nonchalantly of mathematicians on the complexity of those solutions. asked me how I thought I would do from around the Conversely, in her work she also at UMR. I nonchalantly replied, ‘I globe, joining the determines what algebraic, asymptotic, think I’ll be OK.’ He continued the seven Nebraska geometric, or topological properties conversation by saying, ‘I mean, how Susan Hermiller faculty previously of a group are implied by such do you think you will do with the inducted. algorithms. She is known for her work research?’ And I replied, ‘I think I The AMS fellows program recog- on rewriting systems for groups, and can write a paper or two every year,’ nizes those who have made outstand- in particular, developing algorithms as that was what I had perceived as ing contributions to the creation, using computers with a finite amount sufficient. Al said, ‘What if that won’t exposition, advancement, communi- cation, and utilization of mathemat- of memory, with applications to the be enough?’” study of 3-manifolds (topological Peterson said Henderson has far ics. Hermiller is one of 65 who were elected fellows in the class of 2019. spaces that locally look like exceeded that goal. 3-dimensional Euclidean space) and Born March 9, 1942, in Buffalo, Hermiller was inducted for her contributions to combinatorial and the study of groups of piecewise linear New York, and raised in Sioux Falls, homeomorphisms. South Dakota, Peterson received his geometric group theory and for service to the profession, particularly in sup- Hermiller’s service to the bachelor’s and master’s degrees from profession includes serving on the the South Dakota School of Mines and port of underrepresented groups. Technology and his Ph.D. in 1968 from Hermiller’s research in geometric See HERMILLER on Page 14 the University of Tennessee, Knoxville. “My dad was a candy salesman, and he was a very hard worker,” said Peterson, who has four siblings. “I feel Walker named AWM Fellow like that really rubbed off on me. And udy Walker, Aaron Douglas leadership in promoting girls and my mother was either the smartest JProfessor of Mathematics and women in mathematics and STEM or second-smartest in her class. She associate vice chancellor for faculty (science, technology, engineering always talked about wanting to go to and academic affairs, has been named and mathematics) fields, mentoring college.” a fellow of the activities, service to the profession, Peterson, an avid Husker athletics Association mathematical exposition, and fan (he has season tickets to Nebraska for Women in excellence in teaching and research. football, women’s basketball, and Mathematics for She was nominated by Petronela Radu, softball) and stamp collector (he has her dedication Olson Professor of Mathematics, and over 1 million), met his wife, Tina, of to creating a Sylvia Wiegand, professor emerita of 56 years, at the South Dakota School more inclusive mathematics. Wiegand is a member of Mines, where they both worked in community within of the 2018 inaugural class of AWM the cafeteria. They are very proud of mathematics fields. fellows. the accomplishments of their three Judy Walker The fellows Among Walker’s many efforts children and eight grandchildren. program toward increasing the success and “I hope I’m remembered for trying recognizes individuals who have visibility of women in math are to show my love of mathematics,” demonstrated a sustained commitment co-founding the annual Nebraska said Peterson, who said he feels very to the support and advancement Conference for Undergraduate Women blessed to be a professor at Nebraska of women in the mathematical in Mathematics, co-creating the All and to have such wonderful colleagues sciences. Fellows epitomize the Girls/All Math summer camp for high in the Department. “I also really mission of the association, which is to school girls, and leading a National like that I got to have so many Ph.D. promote equitable opportunities and Science Foundation INCLUDES students. That’s the most anybody’s support for women and girls in the funded project aimed at increasing the had in the Department.” mathematical sciences. number of women with mathematics - Lindsay Augustyn } Walker was chosen for her doctorates. } www.math.unl.edu/friends Fall 2018 11 Faculty News AWARDS AND PROMOTIONS lsa.umich.edu/events/women- Additional research grants: in-mathematics-of-materials- Susan Hermiller: Simons Professor of workshop/). The workshop was Collaboration grant Mathematics featured in the AWM October { Tri Lai: Simons Collaboration grant Allan Donsig newsletter (https://sites.google. has been com/site/awmmath/home). Radu Kyungyong Lee: NSF Individual selected to the and Mikil Foss were also invited Investigator grant, University of inaugural class to speak at the 10th Workshop on Nebraska Collaboration Planning of Faculty Fellows Dynamic Systems in Southern Italy. grant with UNL mechanical for Student Assistant engineering and UNK mathematics Allan Donsig Success for the Professor of 2018-2019 Xavier Perez Gimenez: Simons Mathematics Collaboration grant academic year by the Executive Alexandra Vice Chancellor’s Office. Fellows Richard Rebarber: Simons Seceleanu will spend the year learning about Collaboration grant was presented student retention, engaged learning, with the $5,000 Alexandra Seceleanu and and degree completion. Harold and Richard Rebarber: NSF Esther Edgerton Conference grant Central States Yu Jin has Alexandra Mathematics Undergraduate been promoted Seceleanu Junior Faculty Research (held at UNL April 20-21) to associate Award in 2018, professor in the which honors an outstanding Wendy Smith: NSF Computer Department of junior faculty member who has Science for All grant Adapt, Mathematics. demonstrated creative research, Implement, and Research for extraordinary teaching abilities, Nebraska (AIR@NE; see story at Assistant and academic promise. Seceleanu go.unl.edu/airne), NSF I-USE Professor Yvonne also was awarded a $25,000 FIRST grant NIC-Transform, NSF Noyce Yu Jin Lai is the 2018 (For Inspiration and Recognition research track grant Teacher recipient of of Science and Technology) Award Leadership (T-LEAD), NSF Noyce the College from Nebraska EPSCoR in 2018 for Master Teaching Fellows grant Distinguished her proposal “Homological Algebra NebraskaSTEM Teaching Award. for Geometric and Computational Mark Walker: NSF Conference This $1,000 Applications.” The FIRST Award grant award is given program is designed to help early in recognition career faculty initiate their research of excellence in programs and compete more NEW FACULTY teaching. Lai effectively for NSF CAREER grants. Yvonne Lai also received Josh Wendy Smith, a Top Three Paper award for Brummer a proceedings paper for the research 2018 Conference on Research associate Assistant in Undergraduate Mathematics professor in Professor of Education. the Center Practice Josh for Science, Brummer earned Petronela Mathematics his Ph.D. in Radu has been and Computer the summer of 2018 from promoted to Wendy Smith Education, was full professor awarded the Kansas State University, where he studied Fourier analysis. Being a of mathematics 2018 Don Miller Distinguished Kearney native, he is excited to have and received the Service Award from the Nebraska made a return to his home state of Leland J. and Association of Teachers of Nebraska. His current work relates Dorothy H. Olson Mathematics. The NATM board to boundedness properties of various Petronela Radu Professorship established the Don Miller pseudodifferential operators, but in 2018. In Distinguished Service Award in he also is interested in contributing May, she co-organized and served 1989. Its purpose is to honor to mathematics education research, as a project leader of a Women mathematics educators for their specifically how students and learn in Mathematics of Materials contribution to the improvement of best by using interactive math applets workshop (https://mcaim.math. mathematics education in the state. and technology.

12 Fall 2018 www.math.unl.edu/give Faculty/Staff News { Orr returns to native Scotland n 2011, John Orr left Nebraska Orr also keeps a toe in the waters IMathematics after 20 years to work of mathematics, having published a at Google in California. few papers during his time at Google, During his time with the and is very glad to finally know the Department, he was vice chair; taught answer to a question which he had dozens of courses (Math 203 and worked on all his years at Nebraska Math 825 were his favorites, he said); (see http://JohnOrr.us#24 for details). and created the online testing system Orr and his family are living in used by thousands of University of the rural Scottish Borders not far from Nebraska-Lincoln students every year. Edinburgh where he grew up, and he Now, seven years later and still at keeps in sync with work thanks to Google, Orr has made another big move, fibre-optic broadband and frequent this time back to his native Scotland. trips to London. At Google in California, Orr “Returning to Scotland after so developed e-commerce payment many years living in England, Canada, systems that handled over $1 billion and the U.S. has been a remarkable in transactions and open-source experience,” Orr said. “I often think of educational software platforms used that line of T S Eliot, ‘We shall not by millions of students worldwide. cease from exploration, and the end COURTESY PHOTO His current work at Google London of all our exploring will be to arrive John Orr and his family are living continues his interest in education at where we started and know the place in the rural Scottish Borders not far scale, building software for projects for the first time.’ There is definitely from Edinburgh where he grew up. such as “CS First,” which aims to help some feeling of that sort here.” His current work at Google London teachers and parents develop kids’ See http://JohnOrr.us for more continues his interest in education at interest and skills in computer science. about Orr’s activities. } scale and building software for projects.

NEW POSTDOCTORAL FACULTY NEW STAFF

Thomas Kindred Doug Pellatz Postdoc Thomas Kindred earned his Doug Pellatz joined the Department Ph.D. in Mathematics in 2018 from in April 2018 as the undergraduate the University of Iowa. His research advisor. He advises current in low-dimensional topology focuses undergraduate students in Mathematics on surfaces in link exteriors. The basic and Physics, meets with potential idea is that the space around a knotted undergraduate students, and serves circle carries a wealth of mathematical as the campuswide contact for math data, and surfaces help parse this data. placement and the Math Placement Before starting graduate school in Iowa, Kindred taught Exam. Doug comes to our department after spending about high school math for a year in his hometown of Columbus, four and a half years as an advisor and the liaison to the Ohio, and for three years in the small town of Potts Camp, Department in the College of Arts and Sciences Academic Mississippi. He currently serves on the Putnam Exam and Career Advising Center, and he is looking forward to Committee. learning more about the staff and faculty in Mathematics. Doug was born and raised in rural Plainview, Nebraska, Amanda Laubmeier but he did move around the state as a child. He earned a Bachelor of Science in Interdisciplinary Sciences with an Marilyn M. Hitz Postdoctoral Faculty emphasis on Atmospheric Sciences from the South Dakota Fellow Amanda Laubmeier earned her School of Mines & Technology in 2007. He originally came Ph.D. in Applied Mathematics from to Lincoln to pursue a graduate degree in Meteorology/ North Carolina State University and Climatology, but ended up working for the Athletic her B.S. from the University of Arizona. Department as an assistant academic counselor where he Her work is in the area of mathematical tutored math and meteorology. Doug is currently pursuing a ecology, and she is serving as the faculty master’s degree in higher education administration, and he sponsor for the undergraduate AWM devotes much of his spare time to his wife, Mary, and their chapter. families. www.math.unl.edu/friends Fall 2018 13 {Alumni News The art of applied analysis inda Bors was in first grade when in her work, Lshe realized how much she loved which included “Although mathematics numbers. In seventh grade, the Crete, programming, is considered a science, Nebraska, native started imagining military modeling applied analysis is also pursuing a career in math. and simulation, As an undergraduate math developing considered an art due to education major at the University of advanced the creativity needed in Nebraska-Lincoln, Bors turned those spreadsheets, developing an analytical imaginings into reality. and determining technique for a specific She’s grateful for the personal Linda Bors military application and being connections she had with her requirements for instructors, in particular her various programs. She also put her able to apply it.” undergraduate advisor Jim Lewis, analytical and financial skills to good - Linda Bors considering the large size of Nebraska. use as her division’s financial manager “I was a very serious student and when it received millions of dollars for really appreciated math professors new modeling development. shows, and events focused on noticing that I always came to class An especially proud moment community betterment and public prepared and asked questions as for Bors came when she was asked to policy. She takes on major projects in needed,” Bors said. analyze the value of flying hours in her neighborhood. She also volunteers After graduation, Bors pursued the training bomber and tanker crews, by planning and organizing events her MBA while teaching at Morton a task which had been previously and offering computer support for Junior High School in Omaha. She unsuccessful. communications, research, and took 6 credits each semester while “I used learning curve concepts in database development. teaching a full-time program that the ‘art’ of conducting this quantitative Her travels have included places emphasized teacher-developed analysis and was successful,” Bors said. inside the continental U.S. and Costa worksheets. “I received both an award and a salary Rica, and she plans to visit China and “I did not take much time for fun, increase for this work.” Germany soon. but fortunately, I enjoyed my business One takeaway she had from these Bors’ Czech heritage has always classes very much,” Bors said. experiences was being able to see the been an important part of her life, but She wanted to use math relationship between her academic she didn’t become interested in local background and business skills in background and the real world. history until she did ancestry research her career, so she became a market “Although mathematics is in 2014. “Czech foods and way of research analyst at InterNorth in the considered a science, applied analysis life were all around me” through Liquid Fuels Division. A later change is also considered an art due to the childhood, Bors said. in leadership meant she would have to creativity needed in developing an The advice Bors gives to current move to Houston, which was out of the analytical technique for a specific students comes from her experience question for Bors. application and being able to apply it,” combining a variety of skills in her Instead, she became an Air Bors said. career: “There’s a need to keep up with Force civilian at the U.S. Strategic Since retiring in 2017, Bors today’s technological world from many Command. She was able to use her attends events such as community perspectives.” math, computer, and business skills theater shows, Omaha Broadway - Alli Davis }

improve the representation of women Conferences for Undergraduate HERMILLER From Page 11 in mathematics includes service on the Women in Mathematics. AMS-ASA-AWM-IMS-MAA-NCTM- As Graduate Chair for the math AMS Council and Science Policy SIAM Joint Committee on Women department, she has greatly enhanced Committee, and chairing the in the Mathematical Sciences, as a the placement of many Nebraska development committees for both the co-author of UNL’s NSF-ADVANCE students in prestigious internships and GRE subject test and the Major Field best practices documents, and as an non-academic careers both locally and Test in mathematics. Her work to initial co-organizer of the Nebraska nationally. }

14 Fall 2018 www.math.unl.edu/give Alumni News { Class Notes WHERE HAS YOUR Eric Eager (Ph.D. ’12) provides analytical insights to all 32 NFL teams and over 40 college football MATH clients in his position as a data scientist for Pro Football Focus. Eager was a professor for six years before joining PFF in July 2018. SHIRT Matt James (MAT ’13) got TRAVELED? Graduate student Taran Funk married on June 2, 2018. James is a (left) with family in Colorado math teacher at Lincoln Southwest High School, and his wife, Bridgette, is a nurse in a heart cath lab.

Tim Rolling (BS, ’16) is in his third year as a graduate student and teaching assistant at Purdue University. His research area is probability theory. Send us your news at: go.unl.edu/mathcareerprofile

Receive Math News via email If you would prefer to get this newsletter in Math teachers at Walnut Middle School in Grand Island, Nebraska your inbox instead of your mailbox, sign up Send your photos to: [email protected] online at http://www.math.unl.edu/friends.

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o Enclosed is my check for $______. Please make check payable to the University of Nebraska Foundation. o Please charge $______to my: o Visa o Mastercard o Discover o American Express

Card Number Exp. Date Signature o I would like my gift to support the Mathematics Department Fund. This is an expendable fund that is used to support department priorities such as faculty and student professional travel and outreach activities. o I would like my gift to support Fund # ______. See our website, http://www.math.unl.edu/give, for a listing of funds that support the Department of Mathematics and the funds’ purposes. Please mail your contribution to: University of Nebraska Foundation, 1010 Lincoln Mall, Suite 300, Lincoln, NE 68508

Contributions also can be made at http://www.math.unl.edu/give. We invite friends of the Department to contact Chair Tom Marley to discuss creating a new fund for a specific purpose.Thank you for your support.

www.math.unl.edu/friends Fall 2018 15 {Student News Math before dessert Scottsbluff native puts love of UNL, knowledge first hen Lawrence Seminario was Wgrowing up in Scottsbluff, Nebraska, his parents helped him sharpen his math skills by having him read math books and do practice problems under their supervision before he could have any pie for dessert. Seminario didn’t mind it, though, because through that time he spent studying, he realized mathematics was far more than just “problem solving.” COURTESY PHOTO “I got to see that mathematics is Lawrence Seminario graduated from Nebraska with his bachelor’s degree in a precise language that allows us to mathematics in May 2018 and will pursue his Ph.D. in applied mathematics at UNL. logically navigate through the mind, which must always be coupled with of all that. Some of his newest hobbies reality,” Seminario said. “Because of “I am a Cornhusker deep include playing the harmonica and doing my math studies as a kid, I came in mind, body, and soul, writing poetry. to comprehend that I wanted to be a and I can never forget Thanks to Seminario’s Peruvian mathematician.” my great Husker pride.” heritage, he is also fluent in Spanish Seminario decided to pursue and enjoys spending his summer a degree in Mathematics at the - Lawrence Seminario breaks visiting his family in Peru. University of Nebraska-Lincoln for “I have always had a strong various reasons, one being the trip he admiration of the ancient Peruvian made with his high school for UNL’s which he considers one of the most culture, and I like to go visit some of annual Math Day. important activities in which a student the archeological sites and Inca ruins Seminario’s parents, who are can take part at UNL. down there - most notably, Machu both originally from Peru, also had Seminario said the pursuit of a Picchu,” Seminario said. an impact on his desire to study college education opens up challenging Seminario said he knows he still mathematics. His father’s engineering doors with well-paid opportunities. has a lot to learn about life, and that and teaching background and “College will add market value one day, he hopes to benefit society his mother’s involvement in her to your person, and it will make you with his knowledge. He has decided to family’s business were evidence that more competitive in the job place,” pursue a Ph.D. in applied mathematics. mathematical skills could greatly Seminario said. “Don’t forget that He was recently accepted into five benefit one’s career. knowledge is power and enthusiastic graduate schools, but he knew that The president of UNL Math persistence is the way to go.” UNL was where he wanted to be. Club (Pi Mu Epsilon), he is also a On the occasion that he is not “I chose UNL because it has member of the National Society of focusing on school, Seminario said exactly what I’m looking for from a Collegiate Scholars and the National he loves to spend time at UNL’s knowledge perspective, and because Society of Leader and Success. He has Campus Recreation Center, where he of its outstanding, supportive math also participated in research studies enjoys lifting weights, running on the professors,” Seminario said. “Besides, I through the UCARE program, while treadmill, swimming, and playing ball. am a Cornhusker deep in mind, body, tutoring other students in the Math He also enjoys strategy and skill games and soul, and I can never forget my Resource Center. He takes great such as chess, billiards, and bowling, great Husker pride.” pride in his love for Husker football, and he even does some drawing on top – Alli Davis }

16 Fall 2018 www.math.unl.edu/give Student News { Mills earns postdoc research fellowship from NSF ormer mathematics doctoral student Matt Mills was Fawarded a prestigious Mathematical Sciences Postdoc- toral Research Fellowship (MSPRF) by the National Science Foundation (NSF) in 2018. Mills, who earned his doctorate from the University of Nebraska-Lincoln in May, will con- duct his research at Michigan State. Mills will study topics related to cluster algebras, a field of mathematics that is only 20 years old and lies in the inter- section of algebra and combinatorics. The $150,000 fellowship covers three years of full-time research in the sciences and is highly sought-after funding by students to support their transition from graduate studies to professional careers. Mills, who earned a bachelor’s degree in mathematics LINDSAY AUGUSTYN/UNL CSMCE and physics at Kalamazoo College in Michigan before com- Matt Mills will conduct his postdoctoral research at Michigan ing to Nebraska, said he will have the first year of the fellow- State and study topics related to cluster algebras. ship to focus solely on research and a reduced teaching load for the next two years. “In fact, it was at one of these conferences that I found “I started down this path when my advisor Kyungyong the research problem that became my thesis,” Mills said. Lee suggested a research project in this field in my graduate Mills was one of about 35 students to be chosen out linear algebra course,” Mills said. of 260 applicants. The award is designed to give recipients Lee provided not only the suggestion for the project that flexibility in choosing research environments that will have sparked Mills’ interest in the field, but also the funding for maximal impact on their future scientific development. Mills to travel to various conferences early in his career. – Alli Davis }

GET TO KNOW UNDERGRADUATE GET TO KNOW GRADUATE STUDENT Elizabeth Tyler Elizabeth Carlson Where are you from? Omaha, Where are you from? Helena, Nebraska (Westside High) Montana (Carroll College) Favorite math class or instructor? What is the best advice you have My favorite math class was been given regarding graduate definitely Intro to Modern Algebra school or your career? Knowing with Professor Mark Walker. I what to expect in graduate school really loved the way he taught an helped me understand what I was introduction to proofs, and I learned getting into. I knew beforehand a lot about groups and modular arithmetic. I also got to it was possible to go into a class and not be able to do a little bit of extra proof work with him outside of class, understand what the professor was saying. Going into which was so much fun. a situation with as much information as possible helps What are you excited about doing after graduation? I am mitigate the stress by providing a guide to separate the a secondary math education major as well as a math major, typical versus the unusual situations that come up. so I will be getting a job as a math teacher after graduation. What types of jobs are you interested in pursuing after This has been the job I’ve wanted since I was 5 years old. graduation? At this point, my plan is to find a job that What is a goal you have accomplished as a Husker? would allow me to continue to do research in fluid dynamics. Before coming to UNL, teaching meant office supplies, What is a goal you have accomplished as a Husker? This grading, and getting to do math everyday with students past year I got my Master of Arts in mathematics and was who may not be as excited as me, but could maybe learn surprised and honored to receive a fellowship from the to be excited. Over the past four years, I have found that National Science Foundation’s Graduate Research teaching is so much more about relationship building, being Fellowship Program for my proposed thesis work in fluid a positive role model, and doing everything in your power to dynamics. I have been working with Math Club to get help make your students successful. Math just happens to students interested in math modeling competitions, which I be the medium through which to do that. I would not have was passionate about as an undergraduate (see Page 18). learned all of this without my position as a Calculus I TA for What do you hope to cross off your “bucket list” in the the past three years, so for that I have the math department next few years? I have always wanted to go to Chile; my to thank. friend and former neighbor who taught me Spanish grew What do you hope to cross off your “bucket list” in the up there, and it is a beautiful country with diverse natural next few years? I am really hoping to travel to Finland. } habitats. } www.math.unl.edu/friends Fall 2018 17 Student News UNL hosts international math modeling challenge ix undergraduates participated in both of whom won Meritorious They worked on this project for {San international math modeling awards (the levels being Successful, the week prior to the contest, and then competition called the SIMIODE Meritorious, and Outstanding). presented and were judged on their Challenge Using Differential Equations Allison Cruikshank, Jianzhi Lou, and work on Challenge Saturday. Modeling on Oct. 27, 2018. Thuan Luong comprised one team, and The contest was organized by The UNL Department of Pratap Biswakarma, Derek Chew, and mathematics third-year graduate Mathematics had two student teams, Qianyu Dong comprised the other. student Elizabeth Carlson. }

Joel Stebbins Fund Scholarship Don Nguyen, William O’Connell, Undergraduate Clay Christensen, Ge (Grace) Chai, Jacob Pearson, Spencer Prockish, Savannah Howard, Claire Kamas Henry Recker, Ethan Romary, Edwin Schooler, Lawrence Seminario-Romero, Putnam Participants Adam Shafer, Rebecca Sorsen, Quynh Awards Derek Chew, Andrew Haar, Alex Tran, Katherin Tucker, Elizabeth Chair’s Prize Awarded to an Heitzman, Zach Warneke Vandergriend, Collin Victor, Li Wang, outstanding senior mathematics Renneman/Luebbers Caitlin Wilkins, Elise Wordekemper, major Scholarship Yuanfeng Zhang Rebecca Sorsen and Collin Victor Lixin Cao, Jordan Schmitz August 2018: Chun Yin Ho, Nathan Special Scholarships Awards Drusilla Winchester Scholarship Johnston, Han Liu, Zachary Rouzee Note: 56 scholarships were awarded Kushagra Kapil for the 2018-19 academic year. Ruby Matzke Wittemore Dean H and Floreen G Eastman Scholarship Graduate Memorial Scholars Leenah Bouzid (for Nebraska high school Sylvia and Hans Jeans graduates) Program Awards Mathematics Scholarship Fatima Barragan-Herrera, Alexander Sanat Bhandari, Shannyn Bird, Batelaan, Derek Baumfalk, Samuel Carrasco & Fellowships Tomohide Bessho, Emmalee Bielenberg, Richard Bouma, Amber Milton E. Mohr Biotechnology Don Miller Award for Bridgeford, Zach Cairney, Emily Fellowship Outstanding Teaching by a Cleveland, Allison Cruikshank, Shannyn Bird (also inducted into the Graduate Student Grace Dickas, Collin Dougherty, American Society for Biochemistry Mitch Hamidi Stanley Drvol, Brandon Geren, and Molecular Biology Chi Omega Grace Chisholm Young and Andrew Haar, Alexander Heitzman, Lambda Honor Society) William Henry Young Award Robert Hutchinson, James Janvrin, Robert Huben Matthew Meacham, Sean Michel, Outstanding Qualifying Exam Ray Nierman, Nicholas Nguyen, Bachelor’s degrees Michael DeBellevue Hannah Oh, Jesse Osnes, Jared December 2017: Michael Arnold, Ott, Michael Purcell, Lara Quiring, Nicholas Bartholomai, Nathaniel Walter Mientka Teaching Award Amanda Rowley, Isabel Safarik, Benes, Casey Christensen, Ryan Michelle Haver Simon Schoenbeck, Jarod Schwinck, Flynn, Sarah Greenwood, Abigail Outstanding First-Year Student Elizabeth Spaulding, Moriah Hall, Yuance He, Ian Howell, Florentia Award Tiemann, An Tran, Elizabeth Tyler, Kalogeraki, Zachary Legband, Jingyi Catherine Godfrey Zachary Van Roy, Nicholas Verdoni, Liu, Linh Mai, Ankit Pant, Gunnar Bill Leavitt Award Zach Warneke, Jacob Warner, Lane Eugene Peterson, Tanner Rasmussen, Taran Funk Weidner, Qixuan Yang Dilraj Singh, Caston Stack, Jun Sun, Hao Wu, Yi Xie, Xuehua Zhong Irwin Dubinsky Memorial Lloyd Jackson Award Scholars May 2018: Nasam AlTwal, Aurora Marks Miles Davis, Alexander Schroeck Alexandria Barone, Roshan Bengali, Amy Bouska GTA Leadership Shayla Bentley, Tyler Bienhoff, Jason Senior Honors Thesis and Award Corbaley, Simon Deng, Michael Faber, George Nasr Graduated with Distinction Madalyn Fania, Elizabeth Galliart, (directed by): Mustafa Hasan, Claire Henrichsen, Linda Bors Fellowships Rebecca Sorsen (Alex Zupan and Derek Holtz, Alexandria Janvrin, Yiwen Lara Ismert, Matt Reichenbach, Mark Brittenham) Kang, Jae Yong Lee, Curtis Nelson, Karina Uhing

18 Fall 2018 www.math.unl.edu/give Student News { their advisor or co-advisor. Three of and William Henry Young Award DEGREES From Page 3 the faculty, Jamie Radcliffe, Petronela honors emerita faculty member Ten women earned their Radu, and Mark Walker, were each Sylvia Wiegand’s grandparents who mathematics Ph.D. in 2018. It is the advisor or co-advisor for three also were mathematicians. The two noteworthy that the Department did students, while Christine Kelley, Al newest awards of this type are the Amy not award its 10th Ph.D. to a woman Peterson, and emeritus professor Bouska GTA Leadership Award and until 1995 when Ferhan Atici, Nancy Roger Wiegand each had two students. the Linda Bors Fellowships. See http:// Campbell, Betty Harmsen, and Kristin The Department encourages www.math.unl.edu/give for the list of Pfabe earned their degrees. Now, 92 and supports its graduate students funds that support the Department of women have earned the Ph.D. from the by offering awards and supplemental Mathematics. mathematics department, including 45 fellowships funded by donations to the To date, the Department has in the past 10 years. Looking ahead, it University of Nebraska Foundation. awarded 320 Ph.D.s. The 100th was is reasonable to predict that in 2020 the For example, there are cash awards awarded in 1986, the 200th in 2008, Department will award its 100th Ph.D. to the outstanding first-year student and the 300th in 2017. The 2010s will to a woman. and the outstanding qualifying exam, stand out for the dramatic growth of The Department’s doctoral as well as two teaching awards named the Department’s Ph.D. program. With education could not have such a for Don Miller and Walter Mientka. one year to go, 103 students have been successful year without dedicated The Emeritus Faculty Fellowship awarded the Ph.D. in mathematics. work by the faculty teaching graduate fund honors the Department’s Thus, with another strong year in 2019, courses, mentoring students, and emeriti faculty (over 112 graduate the total number of Ph.D.s awarded in supervising doctoral dissertations. The students have received an Emeritus the 2010s might double the previous 19 new Ph.D.s were supported by 16 Faculty Fellowship since 1991), high of 56 Ph.D.s in the 1990s. different faculty members serving as and the Grace Chisholm Young - Jim Lewis }

Jamieson, Jessie On the Well- and Doubly Nonlocal Cahn-Hillard Doctoral degrees posedness and Global Boundary Equations, Petronela Radu Controllability of a Nonlinear Beam Wright, Cory Existence and Beemer, Allison Design and Model, George Avalos (Daniel Regularity of Minimizers for Nonlocal Analysis of Graph-based Codes Toundykov) Functionals, Mikil Foss and Petronela using Algebraic Lifts and Decoding Kass, Nicholas Damped wave Radu Networks, advised by Christine Kelley equations of the p-Laplacian Bolkema, Jessalyn Graph-theoretic type with supercritical sources, Cover Photo of Class of 2018: aspects of polar codes, Judy Walker Mohammad Rammaha The department’s biggest graduating class of doctorates since 1898 includes Canton, Eric F-purity, Strong Kirsch, Rachel K1,∆+1-free and K +1-free Graphs with Many Cliques, (from left to right, back row) Erica F-regularity, and long canonical ω Jamie Radcliffe Miller, Matt Mills, Jessalyn Bolkema, thresholds using Berkovich spaces, Carolyn Mayer, Rachel Kirsch, Allison Wenliang Zhang, Mark Walker and Lindokken, Seth Resolutions of Beemer, Eric Canton; (middle row) Brian Harbourne Finite Length Modules over Complete Jessica De Silva, Corbin Groothuis, Intersections, Mark Walker De Silva, Jessica Graphs with Kelsey Wells, Laura White, Cory few spanning substructures, Jamie Mayer, Carolyn On Coding for Wright, Nick Kass, Jessie Jamieson; Radcliffe Partial Erasure Channels, Christine (front row) Areeba Ikram, Neil Kelley Steinburg, Scott Gensler, Seth Gensler, Scott Fractional Difference Miller, Erica Using Examples in Lindokken, and Mohsen Gheibi. Operators and Related Boundary Precalculus: How Can We Maintain Value Problems, Al Peterson the Cognitive Demand? Yvonne Lai Master’s degrees Gheibi, Mohsen Geometric Linkage Mills, Matthew On maximal green 2018 (MAT): Jared Dixon, Grant and Gorenstein Dimension, Mark sequences, local-acyclicity, and Doerr, Emily Dvorak, Chelsey Grassel, Walker and Roger Wiegand upper cluster algebras, Kyungyong Wendi Herbin, Elizabeth Hock, Lee Groothuis, Corbin Four Kristina Pearson, Jordan Sis, John Mathematical Results on a Theme Steinburg, Neil Torsion in the Strand by Paganini, John Meakin and Jamie Tensor Product, Roger Wiegand 2018 (MS/MA): Laila Awadalla, Radcliffe Wells, Kelsey Properties and Stephen Becklin, Elizabeth Carlson, Ikram, Areeba Green’s Functions convergence of state-based Andrew Hayes, Jie Kang, Dana Lacey, and Lyapunov Inequalities for Nabla Laplacians, Petronela Radu Emily McMillon, John Murphree, Caputo Boundary Value Problems, Al White, Laura Behavior of Solutions Erica Musgrave, George Nasr, Kelsey Peterson to Nonlocal Hyperbolic Equations Quigley, Adam Volk www.math.unl.edu/friends Fall 2018 19 DEPARTMENT OF MATHEMATICS

203 Avery Hall Lincoln, NE 68588-0130

Jessica De Silva gets hooded at the May 2018 commencement with her Ph.D. advisor Professor Jamie Radcliffe (at left). De Silva has a tenure-track position at California State University, Stanislaus, her alma mater. Photo from University Communications.

Math News is a newsletter published for the Nebraska Department Math News is produced and edited by Lindsay Augustyn and Alli Davis of the Center of Mathematics community. To receive Math News via email, please for Science, Mathematics, and Computer Education. Copyright © 2018 register online. Comments regarding newsletter content should be UNL does not discriminate based upon any protected status. sent to Tom Marley ([email protected]), Chair, Nebraska Depart- Please see go.unl.edu/nondiscrimination. ment of Mathematics, 203 Avery Hall, Lincoln, NE, 68588-0130. @UNLMathematics

Fall 2018