André Haefliger

André Haefliger (born 22 May 1929 in Nyon, Switzerland) is a Swiss mathematician who works primarily on topology.

André Haefliger
Born (1929-05-22) 22 May 1929
Alma materUniversity of Lausanne
University of Strasbourg
Scientific career
InstitutionsUniversity of Geneva
Doctoral advisorCharles Ehresmann
Doctoral studentsAugustin Banyaga
Vaughan Jones

He studied mathematics at the University of Lausanne. He received his Ph.D. degree in 1958 from the University of Strasbourg under the supervision of Charles Ehresmann with "Structures feuilletées et cohomologie à valeurs dans un faisceau de groupoïdes".

From 1959 to 1961 he worked at the Institute for Advanced Study in Princeton, New Jersey.

Since 1962 he has been a full professor at the University of Geneva.

Haefliger made important contributions to topology, for example, in knot theory and the theory of foliations, where he introduced Haefliger structures. In 1956, he also found the topological obstruction to the existence of a spin structure on an orientable Riemannian manifold.[1]

In 1974-75, he was President of the Swiss Mathematical Society.

He was an honorary doctor of ETH Zurich (1992).

His students include Vaughan Jones and Augustin Banyaga.



  1. A. Haefliger (1956). "Sur l'extension du groupe structural d'un espace fibré". C. R. Acad. Sci. Paris. 243: 558–560.
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