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Questions taking place in the category of locales, which is given by the opposite of the category of frames. Also appropriate for questions about pointless topology.

25 votes
2 answers
1k views

Another notion of exactness: how to refine it, and where does it fit?

There are many notions of “exactness” in category theory, algebraic geometry, etc. Here I offer another that generalizes the category of frames, the notion of valuation (from probability theory), and …
David Spivak's user avatar
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