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5
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Galois ascent - When is a variety a Weil restriction?
Let $L|K$ be a finite Galois extension of degree $d$ and $X$ be a variety over $K$.
Is there a simple criterion, similar to Galois descent, allowing to determine whether $X$ is the Weil restriction (r …
5
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Converse of "generalized Hilbert 90" / Galois descent
The following generalization of Hilbert 90 can be found in Serre's Corps Locaux (Chap. X, §1, ex.2, p.160 of the French edition), see also this question:
Theorem: If $L|K$ is a finite Galois extension …