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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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Morphism on schemes induced by continuous morphism of sites

As Zhen Lin notes, the question is too vague. However, knowing the etale site of a field is equivalent to knowing its absolute Galois group, and knowing the etale site of a scheme includes knowing its …
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