An Extension of Tate's Theorem on Cohomological Triviality1
نویسنده
چکیده
Let G be a finite group and/: A—*B a homomorphism of G-modules. In one form, Tate's theorem says that if, for some r and all subgroups U of G, Êr~liU, f) is a surjection, HriU, f) is an isomorphism, and Hr+1iU, f) is an injection, then HniU, f) is an isomorphism for all U and all ra. Whaples has asked if the modification of this theorem stated below is true, and this paper answers Whaples' question affirmatively.
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