Tower

Tower
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塔

DOI:
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发表时间:
2017
期刊:
Definitions
影响因子:
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通讯作者:
G. Wrenn
G. Wrenn
中科院分区:
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文献类型:
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作者:
G. Wrenn

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本文定义并研究了环的左相对可分塔.证明了一个子生成元扩张的右深度为2当且仅当环扩张及其右自同态环是一个左相对H-可分塔。这个结果适用于扭曲或普通的Frobenius扩张与满射Frobenius同态。从而,利用该塔条件刻画了有限维Hopf代数的Hopf子代数的正规性.
In this paper, the author defines and investigates a left relative separable tower of rings. It is shown that a progenerator extension has right depth 2 if and only if the ring extension together with its right endomorphism ring is a left relative H-separable tower. This result applies to twisted or ordinary Frobenius extensions with a surjective Frobenius homomorphism. Thereby, normality for Hopf subalgebras of finite dimensional Hopf algebras is characterized via this tower condition.