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arXiv 2203.08433math.GT
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循环字的划分与Goldman-Turaev李双代数

Partitions of cyclic words and Goldman-Turaev Lie bialgebra

Ryosuke Yamamoto

摘要:

由定向曲面上的闭曲线的非平凡同伦类集合生成的自由$\mathbb{Z}$ -模通过两种运算(Goldman括号和Turaev余括号)具有李双代数的结构. M. Chas给出了这两个操作的组合重新定义,通过自然识别的同伦类的闭曲线的表面上的循环字的生成器和他们的逆的基本群的表面。我们提出了一种新的方法,给出了一个组合定义的括号和cobracket,侧重于循环词的分区所提供的信息。

英文摘要:

The free $\mathbb{Z}$-module generated from the set of non-trivial homotopy classes of closed curves on an oriented surface has the structure of Lie bialgebra by two operations, the Goldman bracket and Turaev cobracket. M. Chas gave a combinatorial redefinition of these two operations through a natural identification of the homotopy classes of closed curves on the surface with the cyclic words in the generators and their inverses of the fundamental group of the surface. We present a new approach to give a combinatorial definition of the bracket and cobracket, focusing on the information given by the partitions of cyclic words.

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