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arXiv 2303.06976math.GR
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块的稳定函子等价

Stable functorial equivalence of blocks

Serge Bouc, Deniz Yılmaz

摘要:

设$k$是特征$p>0$的代数闭域,$R$是交换环,$\mathcal{F}$是特征$0$的代数闭域.我们引入了$R$上的稳定对角$p$ -置换函子范畴$\overline{\mathcal{F}_{Rpp_k}}$.证明了范畴$\overline{\mathcal{F}_{\mathbb{F}pp_k}}$是半单的,并给出了它的单对象用单对角$p$ -置换函子的参数化。我们还引入了有限群块之间在$R$上稳定函子等价的概念。证明了:若$G$是有限群,且$b$是$kG$的块幂等元,且具有交换亏群$D$和Frobenius惯性商$E$,则$(G,b)$和$(D\rtimes E,1)$对在$\mathbb{F}$上存在稳定的函子等价.

英文摘要:

Let $k$ be an algebraically closed field of characteristic $p>0$, let $R$ be a commutative ring and let $\mathcal{F}$ be an algebraically closed field of characteristic $0$. We introduce the category $\overline{\mathcal{F}_{Rpp_k}}$ of stable diagonal $p$-permutation functors over $R$. We prove that the category $\overline{\mathcal{F}_{\mathbb{F}pp_k}}$ is semisimple and give a parametrization of its simple objects in terms of the simple diagonal $p$-permutation functors. We also introduce the notion of a stable functorial equivalence over $R$ between blocks of finite groups. We prove that if $G$ is a finite group and if $b$ is a block idempotent of $kG$ with an abelian defect group $D$ and Frobenius inertial quotient $E$, then there exists a stable functorial equivalence over $\mathbb{F}$ between the pairs $(G,b)$ and $(D\rtimes E,1)$.

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