Charles Ehresmann

Charles Ehresmann
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)
Died22 September 1979(1979-09-22) (aged 74)
Amiens, Picardy, France
NationalityFrench
Alma materÉcole Normale Supérieure
Known forAlmost complex manifold
Ehresmann's fibration theorem
Ehresmann connection
Jet bundle
Lie groupoid
Sketch
Strict 2-category
SpouseAndrée Ehresmann
AwardsPrix Francoeur
Scientific career
FieldsMathematics
InstitutionsUniversity of Strasbourg
Paris Diderot University
ThesisSur la topologie de certains espaces homogènes (1934)
Doctoral advisorÉlie Cartan
Doctoral students

Charles Ehresmann (19 April 1905 – 22 September 1979) was a German-born French mathematician who worked in differential topology and category theory.

He was an early member of the Bourbaki group, and is known for his work on the differential geometry of smooth fiber bundles, notably the introduction of the concepts of Ehresmann connection and of jet bundles, and for his seminar on category theory.