Realising the cup-product of local Tate duality

preprint2013arXivOpen access

Abstract

We present an explicit description, in terms of central simple algebras, of a cup-product map which occurs in the statement of local Tate duality for Galois modules of prime order p. Given cocycles f and g, we construct a central simple algebra of dimension p^2 whose class in the Brauer group gives the cup-product of f with g. This algebra is as small as possible.

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