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Local Euler characteristic formula : ウィキペディア英語版
Local Euler characteristic formula
In the mathematical field of Galois cohomology, the local Euler characteristic formula is a result due to John Tate that computes the Euler characteristic of the group cohomology of the absolute Galois group ''GK'' of a non-archimedean local field ''K''.
==Statement==
Let ''K'' be a non-archimedean local field, let ''Ks'' denote a separable closure of ''K'', let ''GK'' = Gal(''Ks''/''K'') be the absolute Galois group of ''K'', and let ''Hi''(''K'', ''M'') denote the group cohomology of ''GK'' with coefficients in ''M''. Since the cohomological dimension of ''GK'' is two, ''Hi''(''K'', ''M'') = 0 for ''i'' ≥ 3. Therefore, the Euler characteristic only involves the groups with ''i'' = 0, 1, 2.

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