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Results tagged with topos-theory
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user 4008
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,...
29
votes
Accepted
What do coherent topoi have to do with completeness?
They are indeed formally equivalent. See for instance Johnstone: Topos theory, p. 243 but here is a quick explanation. Given a topos $T$ one may define a geometric theory associated to it consisting o …
- 22.6k
7
votes
What is the "correct" category of multisets
For purposes not obviously related to the question we (Ekedahl and Salomonsson - Strict polynomial functions and multisets)
considered the following definition of maps of (finite) multisets: In the ca …
- 22.6k