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arXiv 1806.05902math.GTmath.GR
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奇异辫群的换位子群

Commutator Subgroups of Singular Braid Groups

Soumya Dey, Krishnendu Gongopadhyay

摘要:

具有$n$股线的单股编织物$n \geq 3$由Baez和Birman独立地引入。已知由奇异辫形成的么半群嵌入到称为奇异辫群的群中,记为$SG_n$。辫群还有另一种推广,记为$GVB_n$,$n \geq 3$,它是由Fang引入的,作为量子准洗牌结构背后的一组对称性。群$GVB_n$同时推广了经典辫群以及$n$股上的虚拟辫群。我们研究了这些广义辫群的换位子群$SG_n'$和$GVB_n'$.我们证明了$SG_n'$是逆生成的当且仅当$n \ge 5$,$GVB_n'$是逆生成的当且仅当$n \ge 4$ .进一步证明了$SG_n'$和$GVB_n'$都是完美的当且仅当$n \ge 5$ .

英文摘要:

The singular braids with $n$ strands, $n \geq 3$, were introduced independently by Baez and Birman. It is known that the monoid formed by the singular braids is embedded in a group that is known as singular braid group, denoted by $SG_n$. There has been another generalization of braid groups, denoted by $GVB_n$, $n \geq 3$, which was introduced by Fang as a group of symmetries behind quantum quasi-shuffle structures. The group $GVB_n$ simultaneously generalizes the classical braid group, as well as the virtual braid group on $n$ strands. We investigate the commutator subgroups $SG_n'$ and $GVB_n'$ of these generalized braid groups. We prove that $SG_n'$ is finitely generated if and only if $n \ge 5$, and $GVB_n'$ is finitely generated if and only if $n \ge 4$. Further, we show that both $SG_n'$ and $GVB_n'$ are perfect if and only if $n \ge 5$.

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