Commuting Hopf–Galois structures on a separable extension
Commuting Hopf–Galois structures on a separable extension
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可分离扩展上的通勤 Hopf-Galois 结构
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发表时间:
2016
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通讯作者:
Paul J. Truman
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作者:
Paul J. Truman
ABSTRACT Let L∕K be a finite separable extension of local or global fields in any characteristic, let be two Hopf algebras giving Hopf–Galois structures on the extension, and suppose that the actions of on L commute. We show that a fractional ideal ? of L is free over its associated order in H1 if and only if it is free over its associated order in H2. We also study which properties these associated orders share.