yoneda lemma

English - English

Definition of yoneda lemma in English English dictionary

Given a category C with an object A, let HA be a representable functor from C to the category of Sets, and let F be any functor from C to Sets, then there is a "natural" isomorphism between the set F(A) and Nat(HA,F), the set of natural transformations from HA to F

Hyphenation

yoneda lem·ma

Etymology

() Lemma named after the Japanese mathematician Nobuo Yoneda.