Math 2.0

Category theory; homological algebra Representability and the Yoneda lemma Concept

Well-powered category

Summary

A category is well-powered when every object has only a set of subobjects, not a proper class of them. This size condition holds in most categories of everyday algebra and topology. It is a hypothesis of the special adjoint functor theorem and of several existence results for factorisations and limits.

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Further reading

  1. Web https://en.wikipedia.org/wiki/Subobject
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