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arXiv 2008.00276math.GTmath.GR
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关于3-链奇异辫群的若干分解

On some decompositions of the 3-strand Singular Braid Group

Krishnendu Gongopadhyay, Tatyana A. Kozlovskaya, Oleg V. Mamonov

摘要:

令$SB_n$是由辫生成器$σ_i$和奇异辫生成器$τ_i$、$1 \leq i \leq n-1$生成的奇异辫群。令$ST_n$表示作为同态的核的群,该同态对于每个$i$将$σ_i$映射到循环置换$(i, i+1)$并且将$τ_i$映射到$1$。本文研究群$ST_3$ .我们得到一个介绍$ST_3$。证明了$ST_3$同构于$3$链上的奇异纯辫群$SP_3$.证明了群$ST_3$是子群$H$与无限循环群的半直积,其中子群$H$是${\mathbb Z}^2 \ast {\mathbb Z}^2$的HNN-扩张.

英文摘要:

Let $SB_n$ be the singular braid group generated by braid generators $σ_i$ and singular braid generators $τ_i$, $1 \leq i \leq n-1$. Let $ST_n$ denote the group that is the kernel of the homomorphism that maps, for each $i$, $σ_i$ to the cyclic permutation $(i, i+1)$ and $τ_i$ to $1$. In this paper we investigate the group $ST_3$. We obtain a presentation for $ST_3$. We prove that $ST_3$ is isomorphic to the singular pure braid group $SP_3$ on $3$ strands. We also prove that the group $ST_3$ is semi-direct product of a subgroup $H$ and an infinite cyclic group, where the subgroup $H$ is an HNN-extension of ${\mathbb Z}^2 \ast {\mathbb Z}^2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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