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**John Willard Milnor** (born February 20, 1931) is an American mathematician known for his work in differential topology, algebraic K-theory and low-dimensional holomorphic dynamical systems. Milnor is a distinguished professor at Stony Brook University and the only mathematician to have won the Fields Medal, the Wolf Prize, the Abel Prize and all three Steele prizes.

John Willard Milnor | |
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Born | |

Nationality | American |

Alma mater | Princeton University (AB, PhD) |

Known for | Exotic spheres Fáry–Milnor theorem Hauptvermutung Milnor K-theory Microbundle Milnor Map, Milnor number and Milnor fibration in the theory of complex hypersurface singularities, part of singularity theory and algebraic geometry Milnor–Thurston kneading theory Plumbing Milnor–Wood inequality Surgery theory Kervaire-Milnor theorem Isospectral Non-Isometric compact Riemannian manifolds Švarc–Milnor lemma |

Spouse | Dusa McDuff |

Awards | Putnam Fellow (1949, 1950) Sloan Fellowship (1955) Fields Medal (1962) National Medal of Science (1967) Leroy P. Steele Prize (1982, 2004, 2011) Wolf Prize (1989) Abel Prize (2011) |

Scientific career | |

Fields | Mathematics |

Institutions | Princeton University,Stony Brook University |

Doctoral advisor | Ralph Fox |

Doctoral students | Tadatoshi Akiba Jon Folkman John Mather Laurent C. Siebenmann Michael Spivak |

Milnor was born on February 20, 1931, in Orange, New Jersey.^{[1]} His father was J. Willard Milnor, an engineer,^{[2]} and his mother was Emily Cox Milnor.^{[3]}^{[4]} As an undergraduate at Princeton University he was named a Putnam Fellow in 1949 and 1950^{[5]} and also proved the Fáry–Milnor theorem when he was only 19 years old. Milnor graduated with an A.B. in mathematics in 1951 after completing a senior thesis, titled "Link groups", under the supervision of Robert H. Fox.^{[6]} He remained at Princeton to pursue graduate studies and received his Ph.D. in mathematics in 1954 after completing a doctoral dissertation, titled "Isotopy of links", also under the supervision of Fox.^{[7]} His dissertation concerned link groups (a generalization of the classical knot group) and their associated link structure, classifying Brunnian links up to link-homotopy and introduced new invariants of it, called Milnor invariants. Upon completing his doctorate, he went on to work at Princeton. He was a professor at the Institute for Advanced Study from 1970 to 1990.

He was an editor of the *Annals of Mathematics* for a number of years after 1962. He has written a number of books which are famous for their clarity, presentation, and an inspiration for the research by many mathematicians in their areas even after many decades since their publication. He served as Vice President of the AMS in 1976–77 period.

His students have included Tadatoshi Akiba, Jon Folkman, John Mather, Laurent C. Siebenmann, Michael Spivak, and Jonathan Sondow. His wife, Dusa McDuff, is a professor of mathematics at Barnard College and is known for her work in symplectic topology.

One of Milnor's best-known works is his proof in 1956 of the existence of 7-dimensional spheres with nonstandard differentiable structure, which marked the beginning of a new field – differential topology. He coined the term exotic sphere, referring to any *n*-sphere with nonstandard differential structure. Kervaire and Milnor initiated the systematic study of exotic spheres, showing in particular that the 7-sphere has 15 distinct differentiable structures (28 if one considers orientation).

Egbert Brieskorn found simple algebraic equations for 28 complex hypersurfaces in complex 5-space such that their intersection with a small sphere of dimension 9 around a singular point is diffeomorphic to these exotic spheres. Subsequently, Milnor worked on the topology of isolated singular points of complex hypersurfaces in general, developing the theory of the Milnor fibration whose fiber has the homotopy type of a bouquet of *μ* spheres where *μ* is known as the Milnor number. Milnor's 1968 book on his theory, *Singular Points of Complex Hypersurfaces*, inspired the growth of a huge and rich research area that continues to mature to this day.

In 1961 Milnor disproved the Hauptvermutung by illustrating two simplicial complexes that are homeomorphic but combinatorially distinct, using the concept of Reidemeister torsion.^{[8]}

In 1984 Milnor introduced a definition of attractor.^{[9]} The objects generalize standard attractors, include so-called unstable attractors and are now known as Milnor attractors.

Milnor's current interest is dynamics, especially holomorphic dynamics. His work in dynamics is summarized by Peter Makienko in his review of *Topological Methods in Modern Mathematics*:

It is evident now that low-dimensional dynamics, to a large extent initiated by Milnor's work, is a fundamental part of general dynamical systems theory. Milnor cast his eye on dynamical systems theory in the mid-1970s. By that time the Smale program in dynamics had been completed. Milnor's approach was to start over from the very beginning, looking at the simplest nontrivial families of maps. The first choice, one-dimensional dynamics, became the subject of his joint paper with Thurston. Even the case of a unimodal map, that is, one with a single critical point, turns out to be extremely rich. This work may be compared with Poincaré's work on circle diffeomorphisms, which 100 years before had inaugurated the qualitative theory of dynamical systems. Milnor's work has opened several new directions in this field, and has given us many basic concepts, challenging problems and nice theorems.

^{[10]}

His other significant contributions include microbundles, influencing the usage of Hopf algebras, theory of quadratic forms and the related area of symmetric bilinear forms, higher algebraic K-theory, game theory, and three-dimensional Lie groups.

Milnor was elected as a member of the American Academy of Arts and Sciences in 1961.^{[11]} In 1962 Milnor was awarded the Fields Medal for his work in differential topology. He was elected to the United States National Academy of Sciences in 1963 and the American Philosophical Society 1965.^{[12]}^{[13]} He later went on to win the National Medal of Science (1967), the Lester R. Ford Award in 1970^{[14]} and again in 1984,^{[15]} the Leroy P. Steele Prize for "Seminal Contribution to Research" (1982), the Wolf Prize in Mathematics (1989), the Leroy P. Steele Prize for Mathematical Exposition (2004), and the Leroy P. Steele Prize for Lifetime Achievement (2011). In 1991 a symposium was held at Stony Brook University in celebration of his 60th birthday.^{[16]}

Milnor was awarded the 2011 Abel Prize,^{[17]} for his "pioneering discoveries in topology, geometry and algebra."^{[18]} Reacting to the award, Milnor told the *New Scientist* "It feels very good," adding that "[o]ne is always surprised by a call at 6 o'clock in the morning."^{[19]}

In 2013 he became a fellow of the American Mathematical Society, for "contributions to differential topology, geometric topology, algebraic topology, algebra, and dynamical systems".^{[20]}

In 2020 he received the Lomonosov Gold Medal of the Russian Academy of Sciences.^{[21]}

- Milnor, John W. (1963).
*Morse theory*. Annals of Mathematics Studies, No. 51. Notes by M. Spivak and R. Wells. Princeton, NJ: Princeton University Press. ISBN 0-691-08008-9.^{[22]} - —— (1965).
*Lectures on the h-cobordism theorem*. Notes by L. Siebenmann and J. Sondow. Princeton, NJ: Princeton University Press. ISBN 0-691-07996-X. OCLC 58324. - —— (1968).
*Singular points of complex hypersurfaces*. Annals of Mathematics Studies, No. 61. Princeton, NJ: Princeton University Press; Tokyo: University of Tokyo Press. ISBN 0-691-08065-8. - —— (1971).
*Introduction to algebraic K-theory*. Annals of Mathematics Studies, No. 72. Princeton, NJ: Princeton University Press. ISBN 978-0-691-08101-4. - Husemoller, Dale; Milnor, John W. (1973).
*Symmetric bilinear forms*. New York, NY: Springer-Verlag. ISBN 978-0-387-06009-5. - Milnor, John W.; Stasheff, James D. (1974).
*Characteristic classes*. Annals of Mathematics Studies, No. 76. Princeton, NJ: Princeton University Press; Tokyo: University of Tokyo Press. ISBN 0-691-08122-0.^{[23]} - Milnor, John W. (1997) [1965].
*Topology from the differentiable viewpoint*. Princeton Landmarks in Mathematics. Princeton, NJ: Princeton University Press. ISBN 0-691-04833-9. - —— (1999).
*Dynamics in one complex variable*. Wiesbaden, Germany: Vieweg. ISBN 3-528-13130-6.*2nd edn*. 2000.^{[24]}

- Milnor, John W. (1956). "On manifolds homeomorphic to the 7-sphere".
*Annals of Mathematics*.**64**(2). Princeton University Press: 399–405. doi:10.2307/1969983. JSTOR 1969983. MR 0082103. S2CID 18780087. - —— (1959). "Sommes de variétés différentiables et structures différentiables des sphères".
*Bulletin de la Société Mathématique de France*.**87**. Société Mathématique de France: 439–444. doi:10.24033/bsmf.1538. MR 0117744. - —— (1959b). "Differentiable structures on spheres".
*American Journal of Mathematics*.**81**(4). Johns Hopkins University Press: 962–972. doi:10.2307/2372998. JSTOR 2372998. MR 0110107. - —— (1961). "Two complexes which are homeomorphic but combinatorially distinct".
*Annals of Mathematics*.**74**(2). Princeton University Press: 575–590. doi:10.2307/1970299. JSTOR 1970299. MR 0133127. - —— (1984). "On the concept of attractor".
*Communications in Mathematical Physics*.**99**(2). Springer Press: 177–195. Bibcode:1985CMaPh..99..177M. doi:10.1007/BF01212280. MR 0790735. S2CID 120688149. - Kervaire, Michel A.; Milnor, John W. (1963). "Groups of homotopy spheres: I" (PDF).
*Annals of Mathematics*.**77**(3). Princeton University Press: 504–537. doi:10.2307/1970128. JSTOR 1970128. MR 0148075. - Milnor, John W. (2011). "Differential topology forty-six years later" (PDF).
*Notices of the American Mathematical Society*.**58**(6): 804–809.

- Milnor, John Willard; Munkres, James Raymond (2007). "Lectures on Differential Topology". In Milnor, John Willard (ed.).
*Collected papers of John Milnor, Volume 4*. American Mathematical Society. pp. 145–176. ISBN 978-0-8218-4230-0.

**^**Staff.*A COMMUNITY OF SCHOLARS: The Institute for Advanced Study Faculty and Members 1930–1980*Archived November 24, 2011, at the Wayback Machine, p. 35. Institute for Advanced Study, 1980. Accessed November 24, 2015. "Milnor, John Willard M, Topology Born 1931 Orange, NJ."**^**"John Milnor - Biography".*Maths History*. Retrieved March 27, 2023.**^**Helge Holden; Ragni Piene (February 3, 2014).*The Abel Prize 2008–2012*. Springer Berlin Heidelberg. pp. 353–360. ISBN 978-3-642-39448-5.**^**Allen G. Debus (1968).*World Who's who in Science: A Biographical Dictionary of Notable Scientists from Antiquity to the Present*. Marquis-Who's Who. p. 1187.**^**"Putnam Competition Individual and Team Winners". Mathematical Association of America. Retrieved December 10, 2021.**^**Milnor, John W. (1951).*Link groups*. Princeton, NJ: Department of Mathematics.**^**Milnor, John W. (1954).*Isotopy of links*. Princeton, NJ: Department of Mathematics.**^**Ranicki, A. A. (1996). "On the Hauptvermutung". In Ranicki, A. A.; Casson, A. J.; Sullivan, D. P.; Armstrong, M. A.; Rourke, C. P.; Cooke, G. E. (eds.).*The Hauptvermutung Book: A Collection of Papers on the Topology of Manifolds*. K-Monographs in Mathematics. Vol. 1. Kluwer Academic Publishers, Dordrecht. pp. 3–31. doi:10.1007/978-94-017-3343-4_1. ISBN 0-7923-4174-0. MR 1434101. See pp. 3-4**^**Milnor, John (1985). "On the concept of attractor".*Communications in Mathematical Physics*.**99**(2): 177–195. Bibcode:1985CMaPh..99..177M. doi:10.1007/BF01212280. ISSN 0010-3616. S2CID 120688149.**^**Lyubich, Mikhail (1993). "Back to the origin: Milnor's program in dynamics". In Goldberg, Lisa R.; Phillips, Anthony Valiant (eds.).*Topological Methods in Modern Mathematics: A Symposium in Honor of John Milnor's Sixtieth Birthday*. Publish or Perish. pp. 85–92. ISBN 0-914098-26-8.**^**"John Willard Milnor".*American Academy of Arts & Sciences*. Retrieved May 31, 2020.**^**"John W. Milnor".*www.nasonline.org*. Retrieved October 6, 2022.**^**"APS Member History".*search.amphilsoc.org*. Retrieved October 6, 2022.**^**Milnor, John (1969). "A problem in cartography".*Amer. Math. Monthly*.**76**(10): 1101–1112. doi:10.2307/2317182. JSTOR 2317182.**^**Milnor, John (1983). "On the geometry of the Kepler problem".*Amer. Math. Monthly*.**90**(6): 353–365. doi:10.2307/2975570. JSTOR 2975570.**^**Goldberg, Lisa R.; Phillips, Anthony V., eds. (1993),*Topological methods in modern mathematics*, Proceedings of the symposium in honor of John Milnor's sixtieth birthday held at the State University of New York, Stony Brook, New York, June 14–21, 1991, Houston, TX: Publish-or-Perish Press, ISBN 978-0-914098-26-3**^**"2011: John Milnor".*Abelprisen (Abel Prize) website*. Retrieved August 22, 2022.**^**Ramachandran, R. (March 24, 2011). "Abel Prize awarded to John Willard Milnor".*The Hindu*. Retrieved March 24, 2011.**^**Aron, Jacob (March 23, 2011). "Exotic sphere discoverer wins mathematical 'Nobel'".*New Scientist*. Retrieved March 24, 2011.**^**2014 Class of the Fellows of the AMS, American Mathematical Society, retrieved November 4, 2013.**^**Lomonosov Gold Medal 2020.**^**Kuiper, N. H. (1965). "Review:*Morse theory*, by John Milnor".*Bull. Amer. Math. Soc*.**71**(1): 136–137. doi:10.1090/s0002-9904-1965-11251-4.**^**Spanier, E. H. (1975). "Review:*Characteristic classes*, by John Milnor and James D. Stasheff".*Bull. Amer. Math. Soc*.**81**(5): 862–866. doi:10.1090/s0002-9904-1975-13864-x.**^**Hubbard, John (2001). "Review:*Dynamics in one complex variable*, by John Milnor".*Bull. Amer. Math. Soc. (N.S.)*.**38**(4): 495–498. doi:10.1090/s0273-0979-01-00918-1.

Wikiquote has quotations related to **John Milnor**.

- O'Connor, John J.; Robertson, Edmund F., "John Milnor",
*MacTutor History of Mathematics Archive*, University of St Andrews - Home page at SUNYSB
- Photo
- Exotic spheres home page
- The Abel Prize 2011 – video
- Raussen, Martin; Skau, Christian (March 2012). "Interview with John Milnor" (PDF).
*Notices of the American Mathematical Society*.**59**(3): 400–408. doi:10.1090/noti803. - "Seminar Videos, IMS Video Collection".
*Institute for Mathematical Sciences, Stony Brook University*. (40 links from 1965 to May 2021, with 9 videos from Milnor's seminars)