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

2 votes

Is there an interesting definition of a category of test categories?

I'm not sure what “interesting” means in this context. It's probably too much to demand that morphisms between $\widehat{C_1} = \mathbf{Set}^{{C_1}^{\mathrm{Op}}}$ and $\widehat{C_2} = \mathbf{Set}^{ …
Sam Isaacson's user avatar