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generalnonsense
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3 ms
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by
generalnonsense
3y ago
As others said above, `mathlib4` has quite a lot of Sheaf theory, and in particular the category of sheaves of Sets (i.e. Types) over an arbitrary site. In this sense, it is possible to talk about Grothendieck toposes. We don't have th
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generalnonsense
3y ago
To clarify, this is not really related to subobject classifiers. This defines subobjects of `X` as equivalence classes of monomorphisms with target `X`.