Connes, Alain

Connes, Alain

▪ French mathematician
born April 1, 1947, Darguignan, France

      French mathematician who won the Fields Medal in 1983 for his work in operator theory.

      Connes received his bachelor's degree (1970) and his doctorate (1973) from the École Normale Supérieure (now part of the University of Paris (Paris I–XIII, Universities of)). He held appointments at the National Centre for Scientific Research, Paris (1970–74); Queen's University, Kingston, Ontario, Canada (1974–75); the University of Paris VI (1975–77); the Institute for Advanced Study, Princeton, New Jersey, U.S. (1978–79); and the Institute of Advanced Scientific Studies, Bures-sur-Yvette, France (1979– ).

      Connes received the Fields Medal at the International Congress of Mathematicians in Warsaw in 1983. The study of von Neumann (von Neumann, John) algebras—i.e., special algebras of all bounded linear operators on a Hilbert space—began in the 1930s, when their factors were classified, although technical problems remained open until the late '60s, when there was a resurgence of interest. Connes unified a number of concepts in the area that had earlier been considered disparate. He also worked on the application of operator algebras to differential geometry, developing an index theorem analogous to the well-known Atiyah-Singer index theorem (mathematics) which characterizes the number of solutions for an elliptic differential equation (elliptic equation). His work on noncommutative geometry applies operator theory to produce novel geometries. Connes's later work had significant and deep implications in ergodic theory (the study of systems whose final state is independent of their initial state).

      Connes's publications include Géométrie non commutative (1990; Noncommutative Geometry), Operator Algebras, Unitary Representations, Enveloping Algebras, and Invariant Theory (1990), and, with Jean-Pierre Changeux, Conversations on Mind, Matter, and Mathematics (1995).

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Universalium. 2010.

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