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
Paul J. Truman
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作者:
Paul J. Truman

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设L/K是局部或整体域在任意特征下的有限可分扩张,设两个Hopf代数在扩张上给出了Hopf-Galois结构,并假设L的作用是可交换的.我们证明了分数理想?L的序在H1中是自由的,当且仅当它在H2中是自由的。我们还研究了这些关联订单共享哪些属性。
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.