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A topos is a category that behaves very much like the category of sets and possesses a good notion of localization. Related to topos are: sheaves, presheaves, descent, stacks, localization,...

5 votes
2 answers
514 views

Essential geometric morphisms on the étale site.

Hi! There is a risk that this question might be utterly trivial, and if it is, my sincerest apologies, but I haven't been able to find anything in the literature. Let $f:X \rightarrow Y$ be an étal …
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