Retract rationality and Noether's problem

Details Retract rationality and Noether's problem Retract rationality and Noether's problem

2007-04-13

arxiv.org/abs/0704.1700v1

Mathematics

Commutative Algebra

Scientific paper

Let K be any field and G be a finite group. We will prove that, if K is any field, p an odd prime number, and G is a non-abelian group of exponent p with |G|=p^3 or p^4 satisfying [K(\zeta_p):K] <= 2, then K(G) is rational over K. We will also show that K(G) is retract rational if G belongs to a much larger class of p-groups. In particular, generic G-polynomials of G-Galois extensions exist for these groups.

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