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Downloaded from Brill.Com09/24/2021 10:06:53AM Via Free Access 268 Revue De Synthèse : TOME 139 7E SÉRIE N° 3-4 (2018) Chercheur Pour IBM
REVUE DE SYNTHÈSE : TOME 139 7e SÉRIE N° 3-4 (2018) 267-288 brill.com/rds A Task that Exceeded the Technology: Early Applications of the Computer to the Lunar Three-body Problem Allan Olley* Abstract: The lunar Three-Body problem is a famously intractable problem of Newtonian mechanics. The demand for accurate predictions of lunar motion led to practical approximate solutions of great complexity, constituted by trigonometric series with hundreds of terms. Such considerations meant there was demand for high speed machine computation from astronomers during the earliest stages of computer development. One early innovator in this regard was Wallace J. Eckert, a Columbia University professor of astronomer and IBM researcher. His work illustrates some interesting features of the interaction between computers and astronomy. Keywords: history of astronomy – three body problem – history of computers – Wallace J. Eckert Une tâche excédant la technologie : l’utilisation de l’ordinateur dans le problème lunaire des trois corps Résumé : Le problème des trois corps appliqué à la lune est un problème classique de la mécanique newtonienne, connu pour être insoluble avec des méthodes exactes. La demande pour des prévisions précises du mouvement lunaire menait à des solutions d’approximation pratiques qui étaient d’une complexité considérable, avec des séries tri- gonométriques contenant des centaines de termes. Cela a très tôt poussé les astronomes à chercher des outils de calcul et ils ont été parmi les premiers à utiliser des calculatrices rapides, dès les débuts du développement des ordinateurs modernes. Un innovateur des ces années-là est Wallace J. Eckert, professeur d’astronomie à Columbia University et * Allan Olley, born in 1979, he obtained his PhD-degree from the Institute for the History and Philosophy of Science Technology (IHPST), University of Toronto in 2011. -
Wallace Eckert
Wallace Eckert Nakumbuka Dk Eckert aliniambia, "Siku moja, kila mtu atakuwa na kompyuta kwenye dawati lao." Macho yangu yalifunguka. Hiyo lazima iwe katika miaka mapema ya 1950’s. Aliona mapema. -Eleanor Krawitz Kolchin, mahojiano ya Huffington Post, Februari 2013. Picha: Karibu 1930, Jalada la Columbiana. Wallace John Eckert, 1902-1971. Pamoja na masomo ya kuhitimu huko Columbia, Chuo Kikuu cha Chicago, na Yale, alipokea Ph.D. kutoka Yale mnamo 1931 chini ya Profesa Ernest William Brown (1866-1938), ambaye alitumia kazi yake katika kuendeleza nadharia ya mwongozo wa mwezi. Maarufu zaidi kwa mahesabu ya mzunguko wa mwezi ambayo yaliongoza misheni ya Apollo kwenda kwa mwezi, Eckert alikuwa Profesa wa Sayansi ya Chuo Kikuu cha Columbia kutoka 1926 hadi 1970, mwanzilishi na Mkurugenzi wa Ofisi ya Taasisi ya Taaluma ya Thomas J. Watson katika Chuo Kikuu cha Columbia (1937-40), Mkurugenzi wa Ofisi ya Amerika ya US Naval Observatory Nautical Almanac (1940-45), na mwanzilishi na Mkurugenzi wa Maabara ya Sayansi ya Watson ya Sayansi katika Chuo Kikuu cha Columbia (1945-1966). Kwanza kabisa, na daima ni mtaalam wa nyota, Eckert aliendesha na mara nyingi alisimamia ujenzi wa mashine za kompyuta zenye nguvu kusuluhisha shida katika mechanics ya mbinguni, haswa ili kuhakikisha, kupanua, na kuboresha nadharia ya Brown. Alikuwa mmoja wa kwanza kutumia mashine za kadi za kuchomwa kwa suluhisho la shida tata za kisayansi. Labda kwa maana zaidi, alikuwa wa kwanza kusasisha mchakato wakati, mnamo 1933-34, aliunganisha mahesabu na kompyuta za IBM kadhaa na mzunguko wa vifaa na vifaa vya muundo wake ili kusuluhisha usawa wa aina, njia ambazo baadaye zilibadilishwa na kupanuliwa kwa IBM ya "Aberdeen "Calculator inayoweza kupatikana ya Udhibiti wa Mpangilio, Punch Kuhesabu elektroniki, Calculator ya Kadi iliyopangwa, na SSEC. -
Dirk Brouwer
NATIONAL ACADEMY OF SCIENCES D I R K B R O U W ER 1902—1966 A Biographical Memoir by G . M . C LEMENCE Any opinions expressed in this memoir are those of the author(s) and do not necessarily reflect the views of the National Academy of Sciences. Biographical Memoir COPYRIGHT 1970 NATIONAL ACADEMY OF SCIENCES WASHINGTON D.C. DIRK BROUWER September 1, 1902-January 31, 1966 BY G. M. CLEMENCE IRK BROUWER, who contributed more to dynamical astron- D omy than any other astronomer of his time, died on January 31, 1966, after a week in hospital; his death was occa- sioned by an acute disorder of the heart. He is survived by his widow and an only son, James. Brouwer was born in Rotterdam, the Netherlands, on September 1, 1902, the son of a civil service employee. As a stu- dent in the University of Leiden he studied mathematics and astronomy, coming under the influence of Willem de Sitter, who in his own day was the dean of that branch of astronomy in which Brouwer was to do most of his work. Receiving the Ph.D. degree in 1927 under de Sitter, Brouwer came to the United States as a fellow of the International Education Board, spending a year at the University of California in Berkeley and at Yale University, where he was to remain the rest of his life. His initial appointment at Yale was in 1928 as research as- sistant to Ernest W. Brown, who was then the greatest living authority on the motion of the moon. -
Moon-Earth-Sun: the Oldest Three-Body Problem
Moon-Earth-Sun: The oldest three-body problem Martin C. Gutzwiller IBM Research Center, Yorktown Heights, New York 10598 The daily motion of the Moon through the sky has many unusual features that a careful observer can discover without the help of instruments. The three different frequencies for the three degrees of freedom have been known very accurately for 3000 years, and the geometric explanation of the Greek astronomers was basically correct. Whereas Kepler’s laws are sufficient for describing the motion of the planets around the Sun, even the most obvious facts about the lunar motion cannot be understood without the gravitational attraction of both the Earth and the Sun. Newton discussed this problem at great length, and with mixed success; it was the only testing ground for his Universal Gravitation. This background for today’s many-body theory is discussed in some detail because all the guiding principles for our understanding can be traced to the earliest developments of astronomy. They are the oldest results of scientific inquiry, and they were the first ones to be confirmed by the great physicist-mathematicians of the 18th century. By a variety of methods, Laplace was able to claim complete agreement of celestial mechanics with the astronomical observations. Lagrange initiated a new trend wherein the mathematical problems of mechanics could all be solved by the same uniform process; canonical transformations eventually won the field. They were used for the first time on a large scale by Delaunay to find the ultimate solution of the lunar problem by perturbing the solution of the two-body Earth-Moon problem. -
Council Congratulates Exxon Education Foundation
from.qxp 4/27/98 3:17 PM Page 1315 From the AMS ics. The Exxon Education Foundation funds programs in mathematics education, elementary and secondary school improvement, undergraduate general education, and un- dergraduate developmental education. —Timothy Goggins, AMS Development Officer AMS Task Force Receives Two Grants The AMS recently received two new grants in support of its Task Force on Excellence in Mathematical Scholarship. The Task Force is carrying out a program of focus groups, site visits, and information gathering aimed at developing (left to right) Edward Ahnert, president of the Exxon ways for mathematical sciences departments in doctoral Education Foundation, AMS President Cathleen institutions to work more effectively. With an initial grant Morawetz, and Robert Witte, senior program officer for of $50,000 from the Exxon Education Foundation, the Task Exxon. Force began its work by organizing a number of focus groups. The AMS has now received a second grant of Council Congratulates Exxon $50,000 from the Exxon Education Foundation, as well as a grant of $165,000 from the National Science Foundation. Education Foundation For further information about the work of the Task Force, see “Building Excellence in Doctoral Mathematics De- At the Summer Mathfest in Burlington in August, the AMS partments”, Notices, November/December 1995, pages Council passed a resolution congratulating the Exxon Ed- 1170–1171. ucation Foundation on its fortieth anniversary. AMS Pres- ident Cathleen Morawetz presented the resolution during —Timothy Goggins, AMS Development Officer the awards banquet to Edward Ahnert, president of the Exxon Education Foundation, and to Robert Witte, senior program officer with Exxon. -
A Task That Exceeded the Technology: Early Applications of the Computer to the Lunar Three-Body Problem *
A task that exceeded the technology: early applications of the computer to the lunar three-body problem * Allan Olley Abstract: The lunar Three-Body problem is a famously intractable aspect of Newto- nian mechanics. The demand for accurate predictions of lunar motion led to practical ap- proximate solutions of great complexity, constituted by trigonometric series with hundreds of terms. Such considerations meant there was demand for high speed machine computation from astronomers during the earliest stages of computer development. One early innovator in this regard was Wallace J. Eckert, a Columbia University professor of astronomer and IBM researcher. His work illustrates some interesting features of the interaction between computers and astronomy. Keywords: history of astronomy, three body problem, history of computers, W. J. Eckert *This is the submitted (ie unreviewed) version of this article, which appears in its official version at Revue de Synth`ese, Vol. 139, iss. 3-4, pp. 267-288 DOI: 10.1163/19552343-13900014 . Allan Olley, born in 1979, is an independent scholar, whose research focuses on the history of computers and celestial mechanics. ([email protected]) 1 The three body problem in astronomy consists of finding a general expression for the trajectory of three celestial bodies in mutual gravitational attraction. Unlike the two body problem that admits of a ready solution, the three body problem is famously intractable with no definitive solution for the general case and this has made it the focus of a great deal of intellectual effort. The first manifestation of these difficulties was Newton's attempts to use his theory of gravity to derive adequate predictions of the motion of the Moon. -
Pre-Med-Law Dance Slated Monday
SOPHOMORE EDITION STUDENT WEEKLY PUBLICATION RICE INSTITUTE VOL. 16 HOUSTON, TEXAS, FRIDAY. APRIL 17, 1931 NO. 27 PHI BETA KAPPA TOUOLD BANQUET Political Cannons Open Fire » * * » * * + Hi # * '.it i|: * -t- :ti IK * * * * * * * * * * * >i' 'H * « * lit * sT sir * sfi * >|t NEXT WEDNESDAY PETITIONS OF TEN Election of New Senate and PRE-MED-LAW DANCE SLATED MONDAY MORE STUDENTS ARE Governors' Board Scheduled RECEIVED IN R A C E WILEY GEORGE AS THE THRESHER SEES IT FRED GARDNER WILL T11P B411BT „„ r.„ 'itiitmuiii iiimuiiuti THE BALL0T so FAR: Election of a new Senate and a The Thresher has been questioned as to what policy it will have in PLAY FOR AFFAIR AT Between 600 and 700 Votes complete board of governors will be regard to the forthcoming spring elections. It is stated: i DIVED AAITC C| AAD held Wednesday, April 22, at 0 p.m. in For President of the Student Asso- Expected at Election The Thresher will support NO individual candidate. Being a AlvJuIY UfmlYu aLUUll ciation: Jack Scott, Packard Barton, the Faculty Chamber by the Rice Beta On May 4 newspaper of all the students, and not for any particular student, _rt- Reuben Albaugh. chapter of Phi Beta Kappa, it was an- For Vice President of the Student The Thresher feels it would be decidedly unfair to favor one student I Stiffness To Be Taboo at iipO >00 -vutvs Vx- nounced Friday. against another, when each student should have the right of equa ' Association: Helen Forester, Carmen A banquet for all members of Phi Last Big Dance of Season Lewis, Mary Hutton, Marian Mo)linger, pWlcd ti>. -
Appendix a Historical Notes
Appendix A Historical notes A.I Determining all permutation groups of a given degree For this section only, we adopt the following conventions. 1. The early researchers in this area adopted the convention that the degree of a permutation group is the number of points in the set on which it acts minus the number of orbits of length 1. For example, the copy of S3 in S4 (a point stabiliser) was counted as a group of degree 3, not 4. 2. When we say. 'all' permutation groups, we mean up to permutational isomorphism, with the definition of degree as given above. 3. We use the word 'group' to mean 'permutation group'. 4. Whenever a range of degrees is given, it is an inclusive one. 5. We make no claims on the accuracy of others' results unless explicitly stated. How ever, we adopt four benchmarks with which to compare all other results: (a) for all groups up to degree 7 we take the enumeration produced by the CAYLEY function lattice; (b) for the imprimitive groups up to degree 11 we take the list of Butler and McKay (1983); (c) for the imprimitive groups of degree 12 we take the list of Royle (1987); (d) for the primitive groups up to degree 50 we take the list of Sims, which first appeared in full in version 3.5 of CAYLEY, released in 1987. Tables containing these figures appear at the end of the section. 122 Appendix A. Historical notes The first work in this area is probably due to Ruffini (1799), who gives the possible orders of the groups of degree 5. -
Regular Permutation Groups and Cayley Graphs Cheryl E Praeger University of Western Australia
Regular permutation groups and Cayley graphs Cheryl E Praeger University of Western Australia 1 What are Cayley graphs? Group : G with generating set S = s, t, u, . 1 { } Group elements: ‘words in S’ stu− s etc vertices: group elements Cayley graph: Cay(G, S) edges: multiplication from S 2 What are Cayley graphs? If S inverse closed: s S s 1 S ∈ ⇐⇒ − ∈ Cayley graph Cay(G, S): may use undirected edges 3 Some reasonable questions Where: do they arise in mathematics today? Where: did they originate? What: kinds of groups G give interesting Cayley graphs Cay(G, S)? Which graphs: arise as Cayley graphs? Does it matter: what S we choose? Are: Cayley graphs important and why? And: what about regular permutation groups? Let’s see how I go with answers! 4 In Topology: Embedding maps in surfaces Thanks to Ethan Hein: flickr.com 5 Computer networks; experimental layouts (statistics) Thanks to Ethan Hein: flickr.com and Jason Twamley 6 Random walks on Cayley graphs Applications: from percolation theory to group computation How large n: g ‘approximately random’ in G? Independence? Method: for random selection in groups – underpins randomised algorithms for group computation (Babai, 1991) 7 Fundamental importance for group actions in combinatorics and geometry Iwilldescribe: Regular permutation groups Origins of Cayley graphs Links with group theory Some recent work and open problems on primitive Cayley graphs 8 Permutation groups Permutation : of set Ω, bijection g :Ω Ω Symmetric group of all permutations→ of Ω group Sym (Ω): under composition, for -
Regular Permutation Groups and Cayley Graphs Cheryl E Praeger University of Western Australia
Regular permutation groups and Cayley graphs Cheryl E Praeger University of Western Australia 1 Permutation groups Permutation : of set Ω, bijection g :Ω ! Ω Symmetric group of all permutations of Ω group Sym (Ω): under composition, for example g = (1; 2) followed by h = (2; 3) yields gh = (1; 3; 2) g = (1; 2; 3) has inverse g−1 = (3; 2; 1) = (1; 3; 2) Permutation G ≤ Sym (Ω), that is, subset group on Ω: closed under inverses and products (compositions) Example: G = h(0; 1; 2; 3; 4)i < Sym (Ω) on Ω = f0; 1; 2; 3; 4g 2 Interesting permutation groups occur in: Graph Theory: Automorphism groups (edge-preserving perm's) Geometry: Collineations (line-preserving permutations) Number Theory and Cryptography: Galois groups, elliptic curves Differential equations: Measure symmetry - affects nature of so- lutions Many applications: basic measure of symmetry 3 Regular permutation groups Permutation group: G ≤ Sym (Ω) G transitive: all points of Ω equivalent under elements of G G regular: `smallest possible transitive' that is only the identity element of G fixes a point Example: G = h(0; 1; 2; 3; 4)i on Ω = f0; 1; 2; 3; 4g Alternative view: G = Z5 on Ω = f0; 1; 2; 3; 4g by addition 0 4 1 3 2 4 View of regular permutation groups Take any: group G, set Ω := G Define action: ρg : x ! xg for g 2 G; x 2 Ω(ρg is bijection) Form permutation group: GR = fρgjg 2 Gg ≤ Sym (Ω) ∼ GR = G and GR is regular 5 Visualise regular permutation groups as graphs Given generating set S: G = hSi with s 2 S () s−1 2 S Define graph: vertex set Ω = G, edges fg; sgg for g 2 G; s 2 S Example: G = Z5, S = f1; 4g, obtain Γ = C5, Aut (Γ) = D10. -
View This Volume's Front and Back Matter
Titles in This Series Volume 8 Kare n Hunger Parshall and David £. Rowe The emergenc e o f th e America n mathematica l researc h community , 1876-1900: J . J. Sylvester, Felix Klein, and E. H. Moore 1994 7 Hen k J. M. Bos Lectures in the history of mathematic s 1993 6 Smilk a Zdravkovska and Peter L. Duren, Editors Golden years of Moscow mathematic s 1993 5 Georg e W. Mackey The scop e an d histor y o f commutativ e an d noncommutativ e harmoni c analysis 1992 4 Charle s W. McArthur Operations analysis in the U.S. Army Eighth Air Force in World War II 1990 3 Pete r L. Duren, editor, et al. A century of mathematics in America, part III 1989 2 Pete r L. Duren, editor, et al. A century of mathematics in America, part II 1989 1 Pete r L. Duren, editor, et al. A century of mathematics in America, part I 1988 This page intentionally left blank https://doi.org/10.1090/hmath/008 History of Mathematics Volume 8 The Emergence o f the American Mathematical Research Community, 1876-1900: J . J. Sylvester, Felix Klein, and E. H. Moor e Karen Hunger Parshall David E. Rowe American Mathematical Societ y London Mathematical Societ y 1991 Mathematics Subject Classification. Primary 01A55 , 01A72, 01A73; Secondary 01A60 , 01A74, 01A80. Photographs o n th e cove r ar e (clockwis e fro m right ) th e Gottinge n Mathematisch e Ges - selschafft, Feli x Klein, J. J. Sylvester, and E. H. Moore. -
What Groups Were: a Study of the Development of the Axiomatics of Group Theory
BULL. AUSTRAL. MATH. SOC. 01A55, 01A60, 20-03, 20A05 VOL. 60 (1999) [285-301] WHAT GROUPS WERE: A STUDY OF THE DEVELOPMENT OF THE AXIOMATICS OF GROUP THEORY PETER M. NEUMANN For my father for his ninetieth birthday: 15 October 1999 This paper is devoted to a historical study of axioms for group theory. It begins with the emergence of groups in the work of Galois and Cauchy, treats two lines of development discernible in the latter half of the nineteenth century, and concludes with a note about some twentieth century ideas. One of those nineteenth century lines involved Cayley, Dyck and Burnside; the other involved Kronecker, Weber (very strongly), Holder and Probenius. INTRODUCTION As is well known, my father has long had an interest in axiomatics, especially the axiomatics of group theory (see, for example, [21, 34, 35]). My purpose in this essay is to trace the origins and development of currently familiar axiom systems for groups. A far more general study of the origins of the concept of abstract group has been undertaken by Wussing (see [42, Chapter 3, Section 4]) who, however, treats the axiomatics rather differently. George Abram Miller has also written on the subject but perhaps a little erratically. Statements like It should perhaps be noted in this connection that an abstract goup is a set of distinct elements which obey the associative law when they are com- bined and is closed with respect to the unique solutions of linear equations in the special form ax = b. This special form appears already in the Rhind Mathematical Papyrus.