Charles Ehresmann

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Charles Ehresmann
Georges Reeb, Paul Vincensini, Charles Ehresmann.jpeg
Charles Ehresmann (right) at the topology conference 1949 in Oberwolfach, together with Paul Vincensini (middle) and Georges Reeb (left)
Born (1905-04-19)19 April 1905
Straßburg, Alsace-Lorraine, German Empire (today Strasbourg, Alsace, France)
Died 22 September 1979(1979-09-22) (aged 74)
Amiens, Picardy, France
Fields Mathematics
Alma mater École Normale Supérieure
Doctoral advisor Élie Cartan
Doctoral students Jacques Feldbau
Georges Reeb
Wu Wen-Tsün
André Haefliger
Valentin Poénaru
Daniel Tanré
Nguyen Dinh Ngoc
Known for Ehresmann's theorem
Ehresmann connection

Charles Ehresmann (19 April 1905 – 22 September 1979) was a French mathematician who worked on differential topology and category theory. He is known for work on the topology of Lie groups, the jet concept (see jet bundle), and his seminar on category theory.

He attended the École Normale Supérieure in Paris before performing one year of military service. He finished his PhD thesis Sur la topologie de certains espaces homogènes (French: On the topology of certain homogeneous spaces) in 1934 under the supervision of Élie Cartan.

In 1957 he founded the mathematical journal Cahiers de Topologie et Géometrie Différentielle Categoriques.

Jean Dieudonné describes Ehresmann's personality as "... distinguished by forthrightness, simplicity, and total absence of conceit or careerism. As a teacher he was outstanding, not so much for the brilliance of his lectures as for the inspiration and tireless guidance he generously gave to his research students ... "

He had 76 PhD students, including Georges Reeb, Wu Wen-Tsün, André Haefliger, Valentin Poénaru, Daniel Tanré. His first student was Jacques Feldbau.[1]

See also[edit]


  1. ^ Michèle Audin


  • International Conference "Charles Ehresmann : 100 ans", Université de Picardie Jules Verne à Amiens, 7-8-9 October 2005,
  • `The mathematical legacy of Charles Ehresmann', Proceedings of the 7th Conference on the Geometry and Topology of Manifolds: The Mathematical Legacy of Charles Ehresmann, Bedlewo (Poland) 8.05.2005–15 May 2005, Edited by J. Krysinski, J. Pradines, T. Rybicki, R. Wolak, Banach Centre Publications 76, Institute of Mathematics Polish Academy of Sciences, Warsaw, (2007).

External links[edit]