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| Titel: |
Maximal Crossed Product Orders Over Discrete Valuation Rings |
| Auteur: |
Ginosar, Yuval |
| Verschenen in: |
Communications in algebra |
| Paginering: | Jaargang 36 (2008) nr. 1 pagina's 53-62 |
| Jaar: |
2008-01 |
| Inhoud: |
The problem of determining when a (classical) crossed product T = Sf*G of a finite group G over a discrete valuation ring S is a maximal order, was answered in the 1960s for the case where S is tamely ramified over the subring of invariants SG. The answer was given in terms of the conductor subgroup (with respect to f) of the inertia. In this article we solve this problem in general when S/SG is residually separable. We show that the maximal order property entails a restrictive structure on the subcrossed product graded by the inertia subgroup. In particular, the inertia is abelian. Using this structure, one is able to extend the notion of the conductor. As in the tame case, the order of the conductor is equal to the number of maximal two-sided ideals of T and hence to the number of maximal orders containing T in its quotient ring. Consequently, T is a maximal order if and only if the conductor subgroup is trivial. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 12 van 25 gevonden artikelen
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