view wisdom/functor @ 9253:2805033a8bb7

<oerjan> learn An intersection is the opposite of an inverbosection.
author HackBot
date Thu, 13 Oct 2016 00:27:10 +0000
parents 1e323fe0c60e
children 69b3e38974d3
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Functors are just morphisms in the category of small categories.