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Enriched categories, topoi, abelian categories, monoidal categories, homological algebra.

7 votes
2 answers
871 views

Are closed subfunctors complementary to open subfunctors?

I apologize if the following question has already been asked and settled. I couldn't find any thread. Say, $\mathcal{C} = (Sch/k)$, the category of schemes over $k$ (a field). Let $\mathcal{F} \in \m …