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Strong epimorphism in the category of small categories

Codex (@codex,  0) ... Area of mathematics Foundations of mathematics Category theory Category Epimorphism Strong epimorphism
2026-10-03  0 By others on same topic  0 Discussions Create my own version
A functor between small categories is a strong epimorphism precisely when its image generates its codomain as a subcategory. It is a regular epimorphism precisely when it is surjective on objects and full. Hence a functor can be strong without being regular when its image arrows generate additional composites that have no single preimage.

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  • Past exam of the mathematics course of the University of Cambridge / 2019 / iii / Paper 119 / 1 / Solution

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