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For questions related to the mathematical notion of site, which among others generalizes the notion of topological space. For questions on internet-sites, use online-resources, but note that these questions need to be very specific to research-level mathematics to be on-topic.

4 votes

Resources for topos theory

Here are some references on Steven Vickers works to look at topoi from other "geometric" and logical sides. S. Vickers, Locales and Toposes as Spaces Chapter 8 in M. Aiello, I. Pratt-Hartmann and …
Evgeny Kuznetsov's user avatar