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Results tagged with etale-cohomology
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user 88282
for questions about etale cohomology of schemes, including foundational material and applications.
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Étale coverings of cubics and gluings
Consider the plane nodal cubic $X$ given by the equation $y^2=x^2(x+1)$ over a field $k.$ It is not too hard to show that $Y$ has a finite étale covering $X$ of degree $2.$ One does this in the follow …
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