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arXiv 1503.07343math.RA
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Hopf线性范畴的基本群

The fundamental group of a Hopf linear category

Claude Cibils, Andrea Solotar

摘要:

定义了域上霍普夫代数的基本群。为此,我们首先考虑霍普夫代数的分次和伽罗瓦覆盖。后者由具有新的附加结构的线性范畴给出,我们称之为有限群上的Hopf线性范畴。我们将此不变量与底层线性范畴的基本群进行比较,并计算示例族的这些群。

英文摘要:

We define the fundamental group of a Hopf algebra over a field. For this purpose we first consider gradings of Hopf algebras and Galois coverings. The latter are given by linear categories with new additional structure which we call Hopf linear categories over a finite group. We compare this invariant to the fundamental group of the underlying linear category, and we compute those groups for families of examples.

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