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arXiv 1502.04191math.CTmath.GRmath.RT
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关于群的$3$ -表示和$2$ -范畴迹

On the $3$-representations of groups and the $2$-categorical Traces

Wei Wang

摘要:

为了对群表示理论进行$2$ -范畴化,我们引入了群在严格$3$ -范畴中的$3$-表示和群在严格$2$ -范畴中的严格$2$ -范畴作用的概念.通过在严格$3$ -范畴中引入$1$ -自同态的$2$ -范畴迹,我们还对迹的概念进行了$2$-范畴化.对于群$G$的$3$ -表示$ρ$和$G$的元素$f$,$2$ -范畴迹$\mathbb{T}r_2 ρ_f $是范畴.此外,$G$中的$f$的中心化器明确地作用于这个$2$ -明确的迹。构造了有限群的诱导严格$2$ -范畴作用,证明了$2$ -范畴迹$ \mathbb{T}r_2$将诱导严格$2$ -范畴作用化为初始广群的诱导范畴作用.作为推论,我们得到了诱导严格$2$ -范畴作用的$3$ -特征标公式.

英文摘要:

To $2$-categorify the theory of group representations, we introduce the notions of the $3$-representation of a group in a strict $3$-category and the strict $2$-categorical action of a group on a strict $2$-category. We also $2$-categorify the concept of the trace by introducing the $2$-categorical trace of a $1$-endomorphism in a strict $3$-category. For a $3$-representation $ρ$ of a group $G$ and an element $f$ of $G$, the $2$-categorical trace $\mathbb{T}r_2 ρ_f $ is a category. Moreover, the centralizer of $f$ in $G$ acts categorically on this $2$-categorical trace. We construct the induced strict $2$-categorical action of a finite group, and show that the $2$-categorical trace $ \mathbb{T}r_2$ takes an induced strict $2$-categorical action into an induced categorical action of the initia groupoid. As a corollary, we get the $3$-character formula of the induced strict $2$-categorical action.

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