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Computations in Algebraic Geometry with Macaulay 2
Computations in algebraic geometry with Macaulay 2 Editors: D. Eisenbud, D. Grayson, M. Stillman, and B. Sturmfels Preface Systems of polynomial equations arise throughout mathematics, science, and engineering. Algebraic geometry provides powerful theoretical techniques for studying the qualitative and quantitative features of their solution sets. Re- cently developed algorithms have made theoretical aspects of the subject accessible to a broad range of mathematicians and scientists. The algorith- mic approach to the subject has two principal aims: developing new tools for research within mathematics, and providing new tools for modeling and solv- ing problems that arise in the sciences and engineering. A healthy synergy emerges, as new theorems yield new algorithms and emerging applications lead to new theoretical questions. This book presents algorithmic tools for algebraic geometry and experi- mental applications of them. It also introduces a software system in which the tools have been implemented and with which the experiments can be carried out. Macaulay 2 is a computer algebra system devoted to supporting research in algebraic geometry, commutative algebra, and their applications. The reader of this book will encounter Macaulay 2 in the context of concrete applications and practical computations in algebraic geometry. The expositions of the algorithmic tools presented here are designed to serve as a useful guide for those wishing to bring such tools to bear on their own problems. A wide range of mathematical scientists should find these expositions valuable. This includes both the users of other programs similar to Macaulay 2 (for example, Singular and CoCoA) and those who are not interested in explicit machine computations at all. -
Math Matters
MATH MATTERS CORNELL UNIVERSITY JANUARY 2020 Letter From The Chair Ravi Ramakrishna ’88 s is the case every year, our beginning of their first year with Department (along with all others studentsA and faculty are participat- their advisor, in the College) recently reclassi- ing a rich tapestry of mathematical and then as fied all its courses under the new events and scholarship. From needed. This system, with two falling under running conferences and summer often meant the Statistics and Data Science schools to supervising undergradu- never. The new (SDS) heading and the rest under ate research to (of course) proving model has a the Symbolic and Mathematical wonderful theorems, Cornell math- group of 10 first Reasoning (SMR) heading. We are ematicians at all levels are doing semester stu- curious to see how the new clas- great things. dents meeting sifications and requirements will Ravi Ramakrishna As you will read throughout with their advisor affect our enrollments, especially this issue of Math Matters, they once a week for 9 weeks. The at the first-year and sophomore are also being recognized for their intent is to orient students to the levels. outstanding accomplishments. College and break down the barri- Speaking of enrollments, we Our faculty have in the last year ers between faculty and students. will this year graduate about 95 won two College-wide teaching 2019 was the first year where the math majors. We now have the awards, three National Science seminar served all incoming A&S fifth most majors in the College. Foundation CAREER awards, a students and seven Math faculty Our enrollments at junior and Sloan Fellowship, two Simons participated. -
NEW TRENDS in SYZYGIES: 18W5133
NEW TRENDS IN SYZYGIES: 18w5133 Giulio Caviglia (Purdue University, Jason McCullough (Iowa State University) June 24, 2018 – June 29, 2018 1 Overview of the Field Since the pioneering work of David Hilbert in the 1890s, syzygies have been a central area of research in commutative algebra. The idea is to approximate arbitrary modules by free modules. Let R be a Noetherian, commutative ring and let M be a finitely generated R-module. A free resolution is an exact sequence of free ∼ R-modules ···! Fi+1 ! Fi !··· F0 such that H0(F•) = M. Elements of Fi are called ith syzygies of M. When R is local or graded, we can choose a minimal free resolution of M, meaning that a basis for Fi is mapped onto a minimal set of generators of Ker(Fi−1 ! Fi−2). In this case, we get uniqueness of minimal free resolutions up to isomorphism of complexes. Therefore, invariants defined by minimal free resolutions yield invariants of the module being resolved. In most cases, minimal resolutions are infinite, but over regular rings, like polynomial and power series rings, all finitely generated modules have finite minimal free resolutions. Beyond the study of invariants of modules, syzygies have connections to algebraic geometry, algebraic topology, and combinatorics. Statements like the Total Rank Conjecture connect algebraic topology with free resolutions. Bounds on Castelnuovo-Mumford regularity and projective dimension, as with the Eisenbud- Goto Conjecture and Stillman’s Conjecture, have implications for the computational complexity of Grobner¨ bases and computational algebra systems. Green’s Conjecture provides a link between graded free resolutions and the geometry of canonical curves. -
Revised August 2014 DAVID EISENBUD VITA Born April 8, 1947
Revised August 2014 DAVID EISENBUD VITA Born April 8, 1947, New York City US Citizen Married, with two children EDUCATION B. S. University of Chicago 1966 M. S. University of Chicago 1967 Ph. D. University of Chicago 1970 Advisors: Saunders MacLane, J. C. Robson Thesis: Torsion Modules over Dedekind Prime Rings POSITIONS HELD Lecturer, Brandeis University 1970{72 Assistant Professor, Brandeis University 1972{73 Sloan Foundation Fellow 1973{75 Visiting scholar, Harvard University 1973{74 Fellow, I. H. E. S. (Bures-Sur-Yvette) 1974{75 Associate Professor, Brandeis University 1976{80 Visiting Researcher, University of Bonn (SFB 40) 1979{80 Professor, Brandeis University 1980{1998 Research Professor, Mathematical Sciences Research Institute, Berkeley 1986{87 Visiting Professor, Harvard University 1987{88 and Fall 1994 Chercheur Associ´e`al'Institut Henri Poincar´e(CNRS), Paris, Spring 1995. Professor, University of California at Berkeley, 1997{ Director, Mathematical Sciences Research Institute, 1997{ 2007 Director for Mathematics and the Physical Sciences, Simons Foundation, 2010{2012 HONORS, PRIZES Elected Fellow of the American Academy of Arts and Sciences, 2006 Leroy P. Steele Prize for Exposition, American Mathematical Society, 2010 CURRENT RESEARCH INTERESTS Algebraic Geometry Commutative Algebra Computational Methods 1 OTHER LONG-TERM MATHEMATICAL INTERESTS • Noncommutative Rings • Singularity Theory • Knot Theory and Topology 2 Professional Activities American Mathematical Society Council 1978{1982 (as member of the editorial board -
Download a PDF of the Program
Department of Mathematics 2021 Awards Tonight’s Program Welcome + Opening Remarks Professor Jeremy Tyson Chair, Department of Mathematics Land-Grant Statement + College of LAS Remarks Professor Matt Ando Associate Dean for Life and Physical Sciences, College of LAS Alumni Award Recognition + Remarks Steven Armstrong (BS ’92) 2020 Actuarial Science Program Alumnus of the Year Undergraduate Awards Professor Randy McCarthy Director of Undergraduate Studies Alumni Award Recognition + Remarks Danyel Graves Larsen (BA ’04) 2021 Alumni Humanitarian Award Illinois Geometry Lab Awards Professor Philipp Hieronymi Director of Illinois Geometry Lab Graduate Awards Professor Lee DeVille Director of Graduate Studies Alumni Award Recognition + Remarks Michael Stillman (BA ’78) 2021 Outstanding Achievement Award Faculty + Staff Awards Professor Jeremy Tyson Alumni Award Recognition + Remarks Judy Leavitt Walker (MS ’92, Ph.D. ’96) 2021 Outstanding Achievement Award Closing Remarks Professor Jeremy Tyson Undergraduate Awards H. Roy Brahana Prize Salma Wanna Memorial Award The H. Roy Brahana Prize is named for a distinguished The Salma Wanna Memorial Award honors the member of our mathematics faculty and recognizes memory of Salma Wanna, who received her PhD the student with “the most exceptional undergraduate from the University of Illinois in 1976. It is given for mathematics career.” “exceptional performance in mathematics to the Presented with honor to David Brewster, a senior most outstanding continuing student.” mathematics major. Presented with honor to Ariel Lerman, a sophomore mathematics major. Ariel received the Elsie Thomas Most Outstanding Major Awards Fraser Award in 2020 and was recently named a Barry In 1996, the department established the Major Awards M. Goldwater Scholar. He enjoys playing the cello, to recognize the most outstanding undergraduate creative writing and gaming. -
Notices of the American Mathematical
ISSN 0002-9920 Notices of the American Mathematical Society AMERICAN MATHEMATICAL SOCIETY Graduate Studies in Mathematics Series The volumes in the GSM series are specifically designed as graduate studies texts, but are also suitable for recommended and/or supplemental course reading. With appeal to both students and professors, these texts make ideal independent study resources. The breadth and depth of the series’ coverage make it an ideal acquisition for all academic libraries that of the American Mathematical Society support mathematics programs. al January 2010 Volume 57, Number 1 Training Manual Optimal Control of Partial on Transport Differential Equations and Fluids Theory, Methods and Applications John C. Neu FROM THE GSM SERIES... Fredi Tro˝ltzsch NEW Graduate Studies Graduate Studies in Mathematics in Mathematics Volume 109 Manifolds and Differential Geometry Volume 112 ocietty American Mathematical Society Jeffrey M. Lee, Texas Tech University, Lubbock, American Mathematical Society TX Volume 107; 2009; 671 pages; Hardcover; ISBN: 978-0-8218- 4815-9; List US$89; AMS members US$71; Order code GSM/107 Differential Algebraic Topology From Stratifolds to Exotic Spheres Mapping Degree Theory Matthias Kreck, Hausdorff Research Institute for Enrique Outerelo and Jesús M. Ruiz, Mathematics, Bonn, Germany Universidad Complutense de Madrid, Spain Volume 110; 2010; approximately 215 pages; Hardcover; A co-publication of the AMS and Real Sociedad Matemática ISBN: 978-0-8218-4898-2; List US$55; AMS members US$44; Española (RSME). Order code GSM/110 Volume 108; 2009; 244 pages; Hardcover; ISBN: 978-0-8218- 4915-6; List US$62; AMS members US$50; Ricci Flow and the Sphere Theorem The Art of Order code GSM/108 Simon Brendle, Stanford University, CA Mathematics Volume 111; 2010; 176 pages; Hardcover; ISBN: 978-0-8218- page 8 Training Manual on Transport 4938-5; List US$47; AMS members US$38; and Fluids Order code GSM/111 John C. -
Annual Report 1998–99
Department of Mathematics Cornell University Annual Report 1998Ð99 The image on the cover is taken from a catalogue of several hundred “symmetric tensegrities” developed by Professor Robert Connelly and Allen Back, director of our Instructional Computer Lab. (The whole catalogue can be viewed at http://mathlab.cit.cornell.edu/visualization/tenseg/tenseg.html.) The 12 balls represent points in space placed at the midpoints of the edges of a cube. The thin dark edges represent “cables,” each connecting a pair of vertices. If two vertices are connected by a cable, then they are not permitted to get further apart. The thick lighter shaded diagonals represent “struts.” If two vertices are connected by a strut, then they are not permitted to get closer together. The examples in the catalogue — including the one represented on the cover — are constructed so that they are “super stable.” This implies that any pair of congurations of the vertices satisfying the cable and strut constraints are congruent. So if one builds this structure with sticks for the struts and string for the cables, then it will be rigid and hold its shape. The congurations in the catalogue are constructed so that they are “highly” symmetric. By this we mean that there is a congruence of space that permutes all the vertices, and any vertex can be superimposed onto any other by one of those congruences. In the case of the image at hand, all the congruences can be taken to be rotations. Department of Mathematics Annual Report 1998Ð99 Year in Review: Mathematics Instruction and Research Cornell University Þrst among private institutions in undergraduates who later earn Ph.D.s. -
Math Times, Summer 2021
SUMMER 2021 DEPARTMENT OF MATHEMATICS MATH TIMES NEWSLETTER U of I partners with other universities to form math and statistics institute National Science Foundation awards $15.5 million for partnership of four Illinois universities The National Science Foundation (NSF) has awarded $15.5 million to four universities in Illinois, including the University of Illinois Urbana-Champaign, to create an institute to bring powerful mathematical ideas to bear on key contemporary scientific and technological challenges. Researchers at the new Institute for Mathematical and Statistical Innovation (IMSI), to be hosted by the University of Chicago, will People gather to hear the Altgeld Chimes ringers play a special Juneteenth concert titled build a platform that accelerates the “Amplify Their Voices: A Celebration of BIPOC Musicians.” | Fred Zwicky, UI Public Affairs translation of applied mathematical and statistical techniques into “The IMSI project is a powerful investment by the solutions for urgent scientific and societal problems. National Science Foundation in four great universities Many of these problems arise naturally in a range of fields and in the state of Illinois,” said Matt Ando, associate dean already being studied across the four partner institutions, for life and physical sciences at the College of LAS, who including climate change, health care, quantum played a key role in forming the institute. “It puts the state information theory, artificial intelligence, data science, and these universities in a position of national leadership economics, and materials science. in bringing mathematical and statistical research to In addition to the University of Illinois Urbana- bear on pressing societal challenges and in training the Champaign, IMSI will include a collaborative group of next generation of mathematicians and statisticians to mathematicians and statisticians from the University of collaborate with their colleagues across the academy and Chicago, Northwestern University, and the University in business, industry, and government.” of Illinois at Chicago. -
Program of the Sessions, San Francisco, CA
Program of the Sessions San Francisco, California, May 3–4, 2003 Special Session on Numerical Methods, Calculations Saturday, May 3 and Simulations in Knot Theory and Its Applications, I Meeting Registration 8:00 AM –10:50AM Room 327, Thornton Hall 7:30 AM –4:00PM Main Lobby (3rd Floor), Thornton Hall Organizers: Jorge Alberto Calvo, North Dakota State University AMS Exhibit and Book Sale Kenneth C. Millett, University of California Santa Barbara 7:30 AM –4:00PM Room 331, Thornton Hall Eric J. Rawdon, Duquesne University 8:00AM Numerical simulations of random knotting using Special Session on Efficient Arrangements of Convex (6) the FVM method. Bodies, I Rob Scharein*, Centre for Experimental and Constructive Mathematics, and Greg Buck,St. 8:00 AM –10:40AM Room 211, Thornton Hall Anselm College (987-55-193) Organizers: Dan P. Ismailescu, Hofstra University 8:30AM Thermodynamics and Topology of Disordered Wlodzimierz Kuperberg, Auburn (7) Knots: Correlations in Trivial Lattice Knot University Diagrams. Sergei Nechaev, LPTMS (Orsay, France) (987-62-98) 8:00AM The cardinality of a finite saturated packing of (1) convex bodies in Ed. 9:00AM Scaling behavior of the average crossing number in Valeriu Soltan, George Mason University (8) equilateral random knots. Preliminary report. (987-52-45) Akos Dobay, University of Lausanne, Yuanan Diao, University of North Carolina at Charlotte, Rob 8:30AM Lattice packings with a gap are not completely Kusner, University of Massachusetts at Amherst, (2) saturated. and Andrzej Stasiak*, University of Lausanne Greg Kuperberg,UC-Davis,Krystyna Kuperberg* (987-54-142) and Wlodzimierz Kuperberg, Auburn University (987-52-86) 9:30AM Scaling Behavior of Closed and Open Random Knots. -
Algebraic Geometry of Bayesian Networks
Algebraic Geometry of Bayesian Networks Luis David Garcia{Puente Dissertation submitted to the Faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Mathematics Reinhard Laubenbacher, Chair Ezra Brown Daniel Farkas Edward Green Mark Shimozono April 01, 2004 Blacksburg, Virginia Keywords: Algebraic Geometry, Bayesian Networks, Computational Algebra, Statistics Algebraic Geometry of Bayesian Networks Luis David Garcia{Puente (ABSTRACT) We develop the necessary theory in algebraic geometry to place Bayesian networks into the realm of algebraic statistics. This allows us to create an algebraic geometry{statistics dictio- nary. In particular, we study the algebraic varieties defined by the conditional independence statements of Bayesian networks. A complete algebraic classification, in terms of primary decomposition of polynomial ideals, is given for Bayesian networks on at most five random variables. Hidden variables are related to the geometry of higher secant varieties. Moreover, a complete algebraic classification, in terms of generating sets of polynomial ideals, is given for Bayesian networks on at most three random variables and one hidden variable. The relevance of these results for model selection is discussed. Partially supported by the CARGO program of the National Science Foundation (DMS- 0138323). Dedication To God. To my wife Rebecca for all her love and support. To my baby daughter Claudia Isabel. To my parents Isabel and Luis David. iii Acknowledgments First, I want to thank my advisor Reinhard Laubenbacher for all his support in these last five years of my life. Reinhard has taught me many things inside and outside of the mathematics world. -
LETTERS to the EDITOR Responses to ”A Word From… Abigail Thompson”
LETTERS TO THE EDITOR Responses to ”A Word from… Abigail Thompson” Thank you to all those who have written letters to the editor about “A Word from… Abigail Thompson” in the Decem- ber 2019 Notices. I appreciate your sharing your thoughts on this important topic with the community. This section contains letters received through December 31, 2019, posted in the order in which they were received. We are no longer updating this page with letters in response to “A Word from… Abigail Thompson.” —Erica Flapan, Editor in Chief Re: Letter by Abigail Thompson Sincerely, Dear Editor, Blake Winter I am writing regarding the article in Vol. 66, No. 11, of Assistant Professor of Mathematics, Medaille College the Notices of the AMS, written by Abigail Thompson. As a mathematics professor, I am very concerned about en- (Received November 20, 2019) suring that the intellectual community of mathematicians Letter to the Editor is focused on rigor and rational thought. I believe that discrimination is antithetical to this ideal: to paraphrase I am writing in support of Abigail Thompson’s opinion the Greek geometer, there is no royal road to mathematics, piece (AMS Notices, 66(2019), 1778–1779). We should all because before matters of pure reason, we are all on an be grateful to her for such a thoughtful argument against equal footing. In my own pursuit of this goal, I work to mandatory “Diversity Statements” for job applicants. As mentor mathematics students from diverse and disadvan- she so eloquently stated, “The idea of using a political test taged backgrounds, including volunteering to help tutor as a screen for job applicants should send a shiver down students at other institutions. -
2021 2008 • Teichmüller Theory and Low-Dimensional Topology, June
Summer Conferences, 2008 – 2021 2008 • Teichmüller Theory and Low-Dimensional Topology, June 14–20, 2008. Organizers: Francis Bonahon, University of Southern California; Howard Masur, University of Illinois at Chicago; Abigail Thompson, University of California at Davis; and Genevieve Walsh, Tufts University. • Scientific Computing and Advanced Computation, June 21–27, 2008. Organizers: John Bell, Lawrence Berkeley National Laboratory; Randall LeVeque, University of Washington; Juan Meza, Lawrence Berkeley National Laboratory. • Computational Algebra and Convexity, June 21–27, 2008. Organizers: Henry Schenck, University of Illinois at Urbana-Champaign; Michael Stillman, Cornell University; Jan Verschelde, University of Illinois at Chicago. 2009 • Mathematical Challenges of Relativity, June 13-19, 2009. Organizers: Mihalis Dafermos, University of Cambridge; Alexandru Ionescu, University of Wisconsin, Madison; Sergiu Klainerman, Princeton University; Richard Schoen, Stanford University. • Inverse Problems, June 20-26, 2009. Organizers: Guillaume Bal, Columbia University; Allan Greenleaf, University of Rochester; Todd Quinto, Tufts University; Gunther Uhlmann, University of Washington • Modern Markov Chains and their Statistical Applications, June 27-July 3, 2009. Organizers: Persi Diaconis, Stanford University; Jim Hobert, University of Florida; Susan Holmes, Stanford University • Harmonic Analysis, June 27- July 3, 2009. Organizers: Ciprian Demeter, Indiana University; Michael Lacey, Georgia Institute of Technology; Christoph Thiele, University