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for questions about etale cohomology of schemes, including foundational material and applications.

28 votes

Textbook for Etale Cohomology

I'll complement the list of well known books on the subject by some freely available documents, which I find user-friendly. Here are great lecture notes , from a course that de Jong (of Stacks Proj …
Georges Elencwajg's user avatar
75 votes

Etale cohomology -- Why study it?

a) Conceptually an algebraic topologist should be interested in étale cohomology, because it answers a very naïve question: given an algebraic variety over $\mathbb C$, how do I calculate algebraicall …
Georges Elencwajg's user avatar