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arXiv math/0111139math.QAmath.CT
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模范畴、弱霍普夫代数与模不变量

Module categories, weak Hopf algebras and modular invariants

Viktor Ostrik

摘要:

我们发展了幺半范畴上的模范畴的抽象无意义(这是环上模的直接分类)。作为应用,我们证明了任何具有n个单对象的半单幺半范畴等价于弱霍普夫代数的表示范畴(T. Hayashi),并在正整数水平上对$\hat{sl}(2)$的融合范畴上的模块范畴进行分类,在此我们再次遇到ADE分类模式。

英文摘要:

We develop abstract nonsense for module categories over monoidal categories (this is a straightforward categorification of modules over rings). As applications we show that any semisimple monoidal category with finitely many simple objects is equivalent to the category of representations of a weak Hopf algebra (theorem of T. Hayashi) and classify module categories over the fusion category of $\hat{sl}(2)$ at a positive integer level where we meet once again ADE classification pattern.

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