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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.

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Is there a concept of a map of Grothendieck sites having dense image?

But I also wonder if there's any kind of notion like this in the category of sites. In topological spaces, a map is dense if it is an epimorphism in the category of Hausdorff topological spaces. … Is there an analogue for sites? …