Cohomological invariants for G-Galois algebras and self-dual normal bases
classification
🧮 math.NT
keywords
algebrascohomologicalconditionsg-galoisinvariantsnormalbasesbasis
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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.
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