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arXiv 1303.0802math.QAmath.RAmath.RT
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关于幺半范畴中的Frobenius和可分代数扩张。应用于花圈

On Frobenius and separable algebra extensions in monoidal categories. Applications to wreaths

Daniel Bulacu, Blas Torrecillas

摘要:

我们用$R$和$S$给出的条件刻画了Frobenius和可分么半群代数扩张$i: R\ra S$.例如,在一定条件下,我们证明了扩张是Frobenius,分别可分的,当且仅当$S$是一个Frobenius,分别可分,代数的范畴中的双模$R$。在$R$是可分的情况下,我们证明了扩张是可分的当且仅当$S$是一个可分代数。类似地,当$R$是Frobenius且在一个主权幺半范畴中可分时,我们证明了扩张是Frobenius当且仅当$S$是一个Frobenius代数且其Nakayama自同构在$R$的限制等于$R$的Nakayama自同构.作为应用,我们得到了几个特征的代数扩张相关联的圈是Frobenius,分别可分的。

英文摘要:

We characterize Frobenius and separable monoidal algebra extensions $i: R\ra S$ in terms given by $R$ and $S$. For instance, under some conditions, we show that the extension is Frobenius, respectively separable, if and only if $S$ is a Frobenius, respectively separable, algebra in the category of bimodules over $R$. In the case when $R$ is separable we show that the extension is separable if and only if $S$ is a separable algebra. Similarly, in the case when $R$ is Frobenius and separable in a sovereign monoidal category we show that the extension is Frobenius if and only if $S$ is a Frobenius algebra and the restriction at $R$ of its Nakayama automorphism is equal to the Nakayama automorphism of $R$. As applications, we obtain several characterizations for an algebra extension associated to a wreath to be Frobenius, respectively separable.

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