nLab Samuel Eilenberg

Samuel ‘Sammy’ Eilenberg (1913-1998) was one of the founders of category theory, with Saunders Mac Lane. Their 1945 paper General Theory of Natural Equivalences introduced category theory with the notions of categories, functors and natural transformations, motivated by formalizing the concept of dual objects.

Further with Eilenberg he developed of the strong links with group theory and group cohomology.


Selected students

Selected writings

On group extensions and group homology via Ext/Tor-functors:

Introducing category theory:

Introducing the Eilenberg-Steenrod axioms for ordinary cohomology:

Introducing abstract group cohomology:

Introducing simplicial sets and semi-simplicial sets (see the historical remarks here):

On algebraic topology:

Introducing the Eilenberg-Zilber theorem:

Introducing Eilenberg-MacLane spaces:

On separable algebras and Frobenius algebras:

On homological algebra:

On homology of loop spaces:

Introducing the notion of closed categories:

On categorical algebra:

category: people

Last revised on May 15, 2025 at 08:48:56. See the history of this page for a list of all contributions to it.