📜 Theorem, law or theory

Category theory

Teoría de categorías

Date
1945 · confidence high
Place
New York (Columbia) and Chicago
Credited to
Samuel Eilenberg and Saunders Mac Lane
People
👤 Samuel Eilenberg1913–1998👤 Saunders Mac Lane1909–2005
Field
Knowledge & symbols

What was discovered

A language of objects, morphisms, functors and natural transformations that describes structures by their relations rather than their content. It became the language of algebraic topology, Grothendieck's algebraic geometry and type theory.

The authors jokingly called it general abstract nonsense.

What it led to

  • homological algebra
  • Grothendieck schemes
  • functional programming (monads)
  • homotopy type theory
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📄 Original publication

General theory of natural equivalencesSamuel Eilenberg, Saunders MacLane · Transactions of the American Mathematical Society · 1945

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