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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

O. Leroy's thesis on fundamental groupoids

Jean Malgoire kindly sent me a scan back to 2015, with authorization to transmit it. So here it is: Link: https://plmbox.math.cnrs.fr/f/7ffa366379144dd4bacc/ Direct Download Link: https://plmbox.m …
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