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Cohomological invariants for G-Galois algebras and self-dual normal bases

We define degree two cohomological invariants for G-Galois algebras over fields of characteristic not 2, and use them to give necessary conditions for the existence of a self--dual normal basis. In some cases, we show that these conditions are also sufficient.

preprint2016arXivOpen access
Eva Bayer-FluckigerRaman Parimala
math.NT
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Eva Bayer-FluckigerRaman Parimala

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