John Horton Conway

John Horton Conway FRS (26 December 1937 – 11 April 2020) was an English mathematician active in the theory of finite groups, knot theory, number theory, combinatorial game theory and coding theory. He also made contributions to many branches of recreational mathematics, most notably the invention of the cellular automaton called the Game of Life.

This article is about the British mathematician. For the American mathematician, see John B. Conway. For other people, see John Conway (disambiguation).

John Horton Conway

FRS
Conway in June 2005
Born(1937-12-26)26 December 1937
Liverpool, England
Died11 April 2020(2020-04-11) (aged 82)
New Brunswick, New Jersey, U.S.
EducationGonville and Caius College, Cambridge (BA, MA, PhD)
Known for
Awards
Scientific career
FieldsMathematics
InstitutionsPrinceton University
ThesisHomogeneous ordered sets (1964)
Doctoral advisorHarold Davenport[1]
Doctoral students
WebsiteArchived version @ web.archive.org

Born and raised in Liverpool, Conway spent the first half of his career at the University of Cambridge before moving to the United States, where he held the John von Neumann Professorship at Princeton University for the rest of his career.[2][3][4][5][6][7] On 11 April 2020, at age 82, he died of complications from COVID-19.[8]

Early life

Conway was born on 26 December 1937 in Liverpool, the son of Cyril Horton Conway and Agnes Boyce.[9][7] He became interested in mathematics at a very early age. By the time he was 11, his ambition was to become a mathematician.[10][11] After leaving sixth form, he studied mathematics at Gonville and Caius College, Cambridge.[9] A "terribly introverted adolescent" in school, he took his admission to Cambridge as an opportunity to transform himself into an extrovert, a change which would later earn him the nickname of "the world's most charismatic mathematician".[12][13]

Conway was awarded a BA in 1959 and, supervised by Harold Davenport, began to undertake research in number theory. Having solved the open problem posed by Davenport on writing numbers as the sums of fifth powers, Conway began to become interested in infinite ordinals.[11] It appears that his interest in games began during his years studying the Cambridge Mathematical Tripos, where he became an avid backgammon player, spending hours playing the game in the common room. He was awarded his doctorate in 1964 and was appointed as College Fellow and Lecturer in Mathematics at Sidney Sussex College, Cambridge.[14] After leaving Cambridge in 1986, he took up the appointment to the John von Neumann Chair of Mathematics at Princeton University.[14]

Conway's Game of Life
Main article: Conway's Game of Life
A single Gosper's Glider Gun creating "gliders" in Conway's Game of Life

Conway was especially known for the invention of the Game of Life, one of the early examples of a cellular automaton. His initial experiments in that field were done with pen and paper, long before personal computers existed.

Since the game was introduced by Martin Gardner in Scientific American in 1970,[15] it has spawned hundreds of computer programs, web sites, and articles.[16] It is a staple of recreational mathematics. There is an extensive wiki devoted to curating and cataloging the various aspects of the game.[17] From the earliest days, it has been a favorite in computer labs, both for its theoretical interest and as a practical exercise in programming and data display. Conway used to hate the Game of Life—largely because it had come to overshadow some of the other deeper and more important things he has done.[18] Nevertheless, the game did help launch a new branch of mathematics, the field of cellular automata.[19]

The Game of Life is known to be Turing complete.[20][21]

Conway and Martin Gardner

Conway's career was intertwined with that of mathematics popularizer and Scientific American columnist Martin Gardner. When Gardner featured Conway's Game of Life in his Mathematical Games column in October 1970, it became the most widely read of all his columns and made Conway an instant celebrity.[22][23] Gardner and Conway had first corresponded in the late 1950s, and over the years Gardner had frequently written about recreational aspects of Conway's work.[24] For instance, he discussed Conway's game of Sprouts (Jul 1967), Hackenbush (Jan 1972), and his angel and devil problem (Feb 1974). In the September 1976 column, he reviewed Conway's book On Numbers and Games and even managed to explain Conway's surreal numbers.[25]

Conway was probably the most important member of Martin Gardner's Mathematical Grapevine. He regularly visited Gardner and often wrote him long letters summarizing his recreational research. In a 1976 visit, Gardner kept him for a week, pumping him for information on the Penrose tilings which had just been announced. Conway had discovered many (if not most) of the major properties of the tilings.[26] Gardner used these results when he introduced the world to Penrose tiles in his January 1977 column.[27] The cover of that issue of Scientific American features the Penrose tiles and is based on a sketch by Conway.[23]

Conferences called Gathering 4 Gardner are held every two years to celebrate the legacy of Martin Gardner, and Conway himself was often a featured speaker at these events, discussing various aspects of recreational mathematics.[28][29]

Major areas of research

Combinatorial game theory

Conway was widely known for his contributions to combinatorial game theory (CGT), a theory of partisan games. This he developed with Elwyn Berlekamp and Richard Guy, and with them also co-authored the book Winning Ways for your Mathematical Plays. He also wrote the book On Numbers and Games (ONAG) which lays out the mathematical foundations of CGT.

He was also one of the inventors of sprouts, as well as philosopher's football. He developed detailed analyses of many other games and puzzles, such as the Soma cube, peg solitaire, and Conway's soldiers. He came up with the angel problem, which was solved in 2006.

He invented a new system of numbers, the surreal numbers, which are closely related to certain games and have been the subject of a mathematical novelette by Donald Knuth.[30] He also invented a nomenclature for exceedingly large numbers, the Conway chained arrow notation. Much of this is discussed in the 0th part of ONAG.

Geometry

In the mid-1960s with Michael Guy, Conway established that there are sixty-four convex uniform polychora excluding two infinite sets of prismatic forms. They discovered the grand antiprism in the process, the only non-Wythoffian uniform polychoron.[31] Conway has also suggested a system of notation dedicated to describing polyhedra called Conway polyhedron notation.

In the theory of tessellations, he devised the Conway criterion which is a fast way to identify many prototiles that tile the plane.[32]

He investigated lattices in higher dimensions and was the first to determine the symmetry group of the Leech lattice.

Geometric topology

In knot theory, Conway formulated a new variation of the Alexander polynomial and produced a new invariant now called the Conway polynomial.[33] After lying dormant for more than a decade, this concept became central to work in the 1980s on the novel knot polynomials.[34] Conway further developed tangle theory and invented a system of notation for tabulating knots, nowadays known as Conway notation, while correcting a number of errors in the 19th-century knot tables and extending them to include all but four of the non-alternating primes with 11 crossings.[35](Some might say "all but 3½ of the non-alternating primes with 11 crossings." The typographical duplication in the published version of his 1970 table seems to be an effort to include one of the two missing knots that was included in the draft of the table that he sent to Fox [Compare D. Lombardero's 1968 Princeton Senior Thesis, which distinguished this one, but not the other, from all others, based on its Alexander polynomial].)

Group theory

He was the primary author of the ATLAS of Finite Groups giving properties of many finite simple groups. Working with his colleagues Robert Curtis and Simon P. Norton he constructed the first concrete representations of some of the sporadic groups. More specifically, he discovered three sporadic groups based on the symmetry of the Leech lattice, which have been designated the Conway groups.[36] This work made him a key player in the successful classification of the finite simple groups.

Based on a 1978 observation by mathematician John McKay, Conway and Norton formulated the complex of conjectures known as monstrous moonshine. This subject, named by Conway, relates the monster group with elliptic modular functions, thus bridging two previously distinct areas of mathematics—finite groups and complex function theory. Monstrous moonshine theory has now been revealed to also have deep connections to string theory.[37]

Conway introduced the Mathieu groupoid, an extension of the Mathieu group M12 to 13 points.

Number theory

As a graduate student, he proved one case of a conjecture by Edward Waring, that every integer could be written as the sum of 37 numbers each raised to the fifth power, though Chen Jingrun solved the problem independently before Conway's work could be published.[38]

Algebra

Conway has written textbooks and done original work in algebra, focusing particularly on quaternions and octonions.[39] Together with Neil Sloane, he invented the icosians.[40]

Analysis

He invented a base 13 function as a counterexample to the converse of the intermediate value theorem: the function takes on every real value in each interval on the real line, so it has a Darboux property but is not continuous.

Algorithmics

For calculating the day of the week, he invented the Doomsday algorithm. The algorithm is simple enough for anyone with basic arithmetic ability to do the calculations mentally. Conway could usually give the correct answer in under two seconds. To improve his speed, he practised his calendrical calculations on his computer, which was programmed to quiz him with random dates every time he logged on. One of his early books was on finite-state machines.

Theoretical physics

In 2004, Conway and Simon B. Kochen, another Princeton mathematician, proved the free will theorem, a startling version of the "no hidden variables" principle of quantum mechanics. It states that given certain conditions, if an experimenter can freely decide what quantities to measure in a particular experiment, then elementary particles must be free to choose their spins to make the measurements consistent with physical law. In Conway's provocative wording: "if experimenters have free will, then so do elementary particles."[41]

Awards and honours

Conway received the Berwick Prize (1971),[42] was elected a Fellow of the Royal Society (1981),[43] became a fellow of the American Academy of Arts and Sciences in 1992, was the first recipient of the Pólya Prize (LMS) (1987),[42] won the Nemmers Prize in Mathematics (1998) and received the Leroy P. Steele Prize for Mathematical Exposition (2000) of the American Mathematical Society. In 2001 he was awarded an honorary degree from the University of Liverpool.[44], and one from Alexandru Ioan Cuza University in 2014[45].

His FRS nomination, in 1981, reads:

A versatile mathematician who combines a deep combinatorial insight with algebraic virtuosity, particularly in the construction and manipulation of "off-beat" algebraic structures which illuminate a wide variety of problems in completely unexpected ways. He has made distinguished contributions to the theory of finite groups, to the theory of knots, to mathematical logic (both set theory and automata theory) and to the theory of games (as also to its practice).[43]

In 2017 Conway was given honorary membership of the British Mathematical Association.[46]

Death

On 8 April 2020, Conway developed symptoms of COVID-19.[47] On 11 April, he died in New Brunswick, New Jersey at the age of 82.[47][48][49][50][51]

Publications
  • 1971 – Regular algebra and finite machines. Chapman and Hall, London, 1971, Series: Chapman and Hall mathematics series, ISBN 0412106205.
  • 1976 – On numbers and games. Academic Press, New York, 1976, Series: L.M.S. monographs, 6, ISBN 0121863506.
  • 1979 – On the Distribution of Values of Angles Determined by Coplanar Points (with Paul Erdős, Michael Guy, and H. T. Croft). Journal of the London Mathematical Society, vol. II, series 19, pp. 137–143.
  • 1979 – Monstrous Moonshine (with Simon P. Norton).[52] Bulletin of the London Mathematical Society, vol. 11, issue 2, pp. 308–339.
  • 1982 – Winning Ways for your Mathematical Plays (with Richard K. Guy and Elwyn Berlekamp). Academic Press, ISBN 0120911507.
  • 1985 – Atlas of finite groups (with Robert Turner Curtis, Simon Phillips Norton, Richard A. Parker, and Robert Arnott Wilson). Clarendon Press, New York, Oxford University Press, 1985, ISBN 0198531990.
  • 1988 – Sphere Packings, Lattices, and Groups[53] (with Neil Sloane). Springer-Verlag, New York, Series: Grundlehren der mathematischen Wissenschaften, 290, ISBN 9780387966175.
  • 1995 – Minimal-Energy Clusters of Hard Spheres (with Neil Sloane, R. H. Hardin, and Tom Duff). Discrete & Computational Geometry, vol. 14, no. 3, pp. 237–259.
  • 1996 – The Book of Numbers (with Richard K. Guy). Copernicus, New York, 1996, ISBN 0614971667.
  • 1997 – The Sensual (quadratic) Form (with Francis Yein Chei Fung). Mathematical Association of America, Washington, DC, 1997, Series: Carus mathematical monographs, no. 26, ISBN 1614440255.
  • 2002 – On Quaternions and Octonions (with Derek A. Smith). A. K. Peters, Natick, MA, 2002, ISBN 1568811349.
  • 2008 – The Symmetries of Things (with Heidi Burgiel and Chaim Goodman-Strauss). A. K. Peters, Wellesley, MA, 2008, ISBN 1568812205.
gollark: Yes.
gollark: Kristforge is for GPUs. You presumably have one of those.
gollark: I think what would be helpful is better cross-server integration i.e. server-to-server networking and chat relays, sort of thing.
gollark: Looking at Terra's post, I kind of agree with their assessment that there's not really a hugely active player base for CC-focused servers, but the "plan" is unhelpful and kind of bad.
gollark: Terra is never wrong. All glory to Terra.

See also

References
  1. John Horton Conway at the Mathematics Genealogy Project
  2. Conway, J. H.; Hardin, R. H.; Sloane, N. J. A. (1996). "Packing Lines, Planes, etc.: Packings in Grassmannian Spaces". Experimental Mathematics. 5 (2): 139. arXiv:math/0208004. doi:10.1080/10586458.1996.10504585.
  3. Conway, J. H.; Sloane, N. J. A. (1990). "A new upper bound on the minimal distance of self-dual codes". IEEE Transactions on Information Theory. 36 (6): 1319. doi:10.1109/18.59931.
  4. Conway, J. H.; Sloane, N. J. A. (1993). "Self-dual codes over the integers modulo 4". Journal of Combinatorial Theory, Series A. 62: 30–45. doi:10.1016/0097-3165(93)90070-O.
  5. Conway, J.; Sloane, N. (1982). "Fast quantizing and decoding and algorithms for lattice quantizers and codes" (PDF). IEEE Transactions on Information Theory. 28 (2): 227. CiteSeerX 10.1.1.392.249. doi:10.1109/TIT.1982.1056484.
  6. Conway, J. H.; Lagarias, J. C. (1990). "Tiling with polyominoes and combinatorial group theory". Journal of Combinatorial Theory, Series A. 53 (2): 183. doi:10.1016/0097-3165(90)90057-4.
  7. MacTutor History of Mathematics archive: John Horton Conway
  8. Bellos, Alex (20 April 2020). "Can you solve it? John Horton Conway, playful maths genius". The Guardian. London, United Kingdom. ISSN 0261-3077. Retrieved 20 April 2020.
  9. "CONWAY, Prof. John Horton". Who's Who 2014, A & C Black, an imprint of Bloomsbury Publishing plc, 2014; online edn, Oxford University Press.(subscription required)
  10. "John Horton Conway". Dean of the Faculty, Princeton University.
  11. Mathematical Frontiers. Infobase Publishing. 2006. p. 38. ISBN 978-0-7910-9719-9.
  12. Roberts, Siobhan (23 July 2015). "John Horton Conway: the world's most charismatic mathematician". The Guardian.
  13. Mark Ronan (18 May 2006). Symmetry and the Monster: One of the greatest quests of mathematics. Oxford University Press, UK. pp. 163. ISBN 978-0-19-157938-7.
  14. Sooyoung Chang (2011). Academic Genealogy of Mathematicians. World Scientific. p. 205. ISBN 978-981-4282-29-1.
  15. Gardner, Martin (October 1970). "Mathematical Games: The fantastic combinations of John Conway's new solitaire game "Life"". Scientific American. Vol. 223. pp. 120–123.
  16. "DMOZ: Conway's Game of Life: Sites". Archived from the original on 17 March 2017. Retrieved 11 January 2017.
  17. "LifeWiki". www.conwaylife.com.
  18. Does John Conway hate his Game of Life? (video)
  19. MacTutor History: The game made Conway instantly famous, but it also opened up a whole new field of mathematical research, the field of cellular automata.
  20. Rendell (2015)
  21. Case (2014)
  22. Martin Gardner, puzzle master extraordinaire by Colm Mulcahy, BBC News Magazine, 21 October 2014: "The Game of Life appeared in Scientific American in 1970, and was by far the most successful of Gardner's columns, in terms of reader response."
  23. Mulcahy (2014).
  24. The Math Factor Podcast Website John H. Conway reminisces on his long friendship and collaboration with Martin Gardner.
  25. Martin Gardner, Penrose Tiles to Trapdoor Ciphers, W. H. Freeman & Co., 1989, ISBN 0-7167-1987-8, Chapter 4. A non-technical overview; reprint of the 1976 Scientific American article.
  26. Interview with Martin Gardner Notices of the AMS, Vol. 52, No. 6, June/July 2005, pp. 602–611
  27. A Life In Games: The Playful Genius of John Conway by Siobhan Roberts, Quanta Magazine, 28 August 2015
  28. Presentation Videos Archived 9 August 2016 at the Wayback Machine from 2014 Gathering 4 Gardner
  29. Bellos, Alex (2008). The science of fun The Guardian, 30 May 2008
  30. Infinity Plus One, and Other Surreal Numbers by Polly Shulman, Discover Magazine, 1 December 1995
  31. J. H. Conway, "Four-dimensional Archimedean polytopes", Proc. Colloquium on Convexity, Copenhagen 1965, Kobenhavns Univ. Mat. Institut (1967) 38–39.
  32. Rhoads, Glenn C. (2005). "Planar tilings by polyominoes, polyhexes, and polyiamonds". Journal of Computational and Applied Mathematics. 174 (2): 329–353. Bibcode:2005JCoAM.174..329R. doi:10.1016/j.cam.2004.05.002.
  33. Conway Polynomial Wolfram MathWorld
  34. Livingston, Charles, Knot Theory (MAA Textbooks), 1993, ISBN 0883850273
  35. Topology Proceedings 7 (1982) 118.
  36. Harris (2015)
  37. Monstrous Moonshine conjecture David Darling: Encyclopedia of Science
  38. Breakfast with John Horton Conway
  39. Conway and Smith (2003): "Conway and Smith's book is a wonderful introduction to the normed division algebras: the real numbers, the complex numbers, the quaternions, and the octonions."
  40. John Baez (2 October 1993). "This Week's Finds in Mathematical Physics (Week 20)".
  41. Conway's Proof Of The Free Will Theorem Archived 25 November 2017 at the Wayback Machine by Jasvir Nagra
  42. "List of LMS prize winners | London Mathematical Society". www.lms.ac.uk.
  43. "John Conway". The Royal Society. Retrieved 11 April 2020.
  44. Sturla, Anna. "John H. Conway, a renowned mathematician who created one of the first computer games, dies of coronavirus complications". CNN. Retrieved 16 April 2020.
  45. "Doctor Honoris Causa for John Horton Conway". Alexandru Ioan Cuza University. Retrieved 7 July 2020.
  46. "Honorary Members". The Mathematical Association. Retrieved 11 April 2020.
  47. Levine, Cecilia (12 April 2020). "COVID-19 Kills Renowned Princeton Mathematician, 'Game Of Life' Inventor John Conway In 3 Days". Mercer Daily Voice.
  48. Zandonella, Catherine (14 April 2020). "Mathematician John Horton Conway, a 'magical genius' known for inventing the 'Game of Life,' dies at age 82". Princeton University. Retrieved 15 April 2020.
  49. Van den Brandhof, Alex (12 April 2020). "Mathematician Conway was a playful genius and expert on symmetry". NRC Handelsblad (in Dutch). Retrieved 12 April 2020.
  50. Roberts, Siobhan (15 April 2020). "John Horton Conway, a 'Magical Genius' in Math, Dies at 82". New York Times. Retrieved 17 April 2020.
  51. Mulcahy, Colm (23 April 2020). "John Horton Conway obituary". The Guardian. ISSN 0261-3077. Retrieved 30 May 2020.
  52. Conway, J. H.; Norton, S. P. (1 October 1979). "Monstrous Moonshine". Bulletin of the London Mathematical Society. 11 (3): 308–339. doi:10.1112/blms/11.3.308 – via academic.oup.com.
  53. Guy, Richard K. (1989). "Review: Sphere packings, lattices and groups, by J. H. Conway and N. J. A. Sloane" (PDF). Bulletin of the American Mathematical Society (N.S.). 21 (1): 142–147. doi:10.1090/s0273-0979-1989-15795-9.

Sources
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