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arXiv 2607.04053math.GR
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关于\(G\)-等变函数幺半群的有限生成集

Finite generating sets for monoids of $G$-equivariant functions

University Center of Exact Sciences and Engineering, University of Guadalajara(瓜达拉哈拉大学精确科学与工程学院)

Ramón H. Ruiz-Medina, Victor M. Lara-Gómez, Gerardo Romero-Rosales

AI总结:

研究\(G\)作用于集合\(X\)时\(G\)-等变函数构成的幺半群的生成集。先给出其单位群\(\operatorname{Aut}_{G}(X)\)生成集基数的界,再用轨道渗透确定使\(\operatorname{End}_{G}(X)\)无有限生成集的条件。

摘要:

给定群\(G\)在集合\(X\)上的作用,所有满足\(f(g\cdot x)=g\cdot f(x)\)对所有\(g\in G\)和\(x\in X\)的\(G\)-等变函数构成一个在复合运算下的幺半群。本文研究它们的生成集。首先,我们给出其单位群(记为\(\operatorname{Aut}_{G}(X)\))生成集基数的界。随后,利用所谓的轨道渗透,即一些被证明是不可或缺的变换并提供关于该幺半群的相关结构信息,我们确定了群\(G\)、集合\(X\)以及作用的条件,这些条件阻止整个幺半群\(\operatorname{End}_{G}(X)\)具有有限生成集。

英文摘要:

Given the action of a group $G$ on a set $X$, the set of all $G$-equivariant functions, i.e., those satisfying $f(g\cdot x)=g\cdot f(x)$ for all $g\in G$ and $x\in X$, forms a monoid under composition. In this work we study their generating sets. First, we propose bounds for the cardinalities of the generating sets of their group of units, denoted by $\operatorname{Aut}_{G}(X)$. Subsequently, using so-called orbital infiltrations, certain transformations that turn out to be indispensable and provide relevant structural information about the monoid, we determine conditions on the group $G$, the set $X$, and the action that prevent the whole monoid $\operatorname{End}_{G}(X)$ from admitting a finite generating set.

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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