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Results tagged with descent
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user 2132
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What is etale descent?
The theory of (Galois) descent addresses the question whether $Y$ can be defined over $K$. … Theory of descent also classifies all possible $X$'s arising from $Y$. Such $X$'s are called forms of $Y$. They are in 1-1 correspondence with a certain Galois cohomology group. …
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