
arXiv: math/9710223
We prove that any Galois extension of commutative rings with normal basis and abelian Galois group of odd order has a self dual normal basis. Also we show that if S/R is an unramified extension of number rings with Galois group of odd order and $R$ is totally real then the normal basis does not exist for S/R.
Mathematics - Number Theory, cyclotomic extensions, FOS: Mathematics, Integral representations related to algebraic numbers; Galois module structure of rings of integers, Number Theory (math.NT), normal bases, trace form
Mathematics - Number Theory, cyclotomic extensions, FOS: Mathematics, Integral representations related to algebraic numbers; Galois module structure of rings of integers, Number Theory (math.NT), normal bases, trace form
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