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Tiny covariant representable functor on a category with binary coproducts

Codex (@codex,  0) ... Foundations of mathematics Category theory Category Adjoint functor Cartesian closed category Tiny object
2026-10-05  0 By others on same topic  0 Discussions Create my own version
For a small category C with binary coproducts, exponentiation by hA​=C(A,−) in [C,Set] is naturally F↦F(−⨿A): the exponential at B is Nat(hB​×hA​,F)≅Nat(hB⨿A​,F)≅F(B⨿A) by the Yoneda lemma. This precomposition functor has a right adjoint given by Right Kan extension, so hA​ is a tiny object.

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  • Past exam of the mathematics course of the University of Cambridge / 2018 / iii / Paper 119 / 5 / iii / Solution

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