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On local weak crossed product orders

Th. Theohari-Apostolidi, A. Tompoulidou (2014)

Colloquium Mathematicae

Let Λ = (S/R,α) be a local weak crossed product order in the crossed product algebra A = (L/K,α) with integral cocycle, and H = σ G a l ( L / K ) | α ( σ , σ - 1 ) S * the inertial group of α, for S* the group of units of S. We give a condition for the first ramification group of L/K to be a subgroup of H. Moreover we describe the Jacobson radical of Λ without restriction on the ramification of L/K.

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