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End (category theory) — Not to be confused with the use of End to represent (categories of) endomorphisms. In category theory, an end of a functor is a universal dinatural transformation from an object e of X to S. More explicitly, this is a pair (e,ω), where e is an… … Wikipedia
Kan extension — Kan extensions are universal constructs in category theory, a branch of mathematics. They are closely related to adjoints, but are also related to limits and ends. They are named after Daniel M. Kan, who constructed certain (Kan) extensions using … Wikipedia
