The modified HS-L conjecture for Hilbert-Speiser fields of type GG

Let KK be a number field and let GG be a finite abelian group. For a GG-Galois extension L/KL/K, let AL/K\mathcal{A}_{L/K} be the associated order and let

TrL/K(OL)1OL\operatorname{Tr}_{L/K}(\mathcal{O}_L)^{-1}\mathcal{O}_L

be the adjusted ring of integers. Say that KK satisfies the modified Leopoldt condition of type GG if this adjusted ring of integers is free as an AL/K\mathcal{A}_{L/K}-module for every GG-Galois extension L/KL/K. mHS-L(K,G)(K,G) conjecture. If KK is a Hilbert-Speiser field of type GG, then KK satisfies the modified Leopoldt condition of type GG. This modified implication accounts for the trace ideal as a possible global obstruction to freeness over the associated order and is proposed as a natural adjustment of the Leopoldt condition.

Sources & referencesView supporting material

Primary source

Nigel P. Byott, James E. Carter, Cornelius Greither and Henri Johnston, “On the restricted Hilbert-Speiser and Leopoldt properties”, arXiv:0905.2737 (2010).

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