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arXiv 2103.08353math.GR
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小阶群的因子分解

Factorizations of groups of small order

Mikhail Kabenyuk

摘要:

设$G$是一个有限群,$A_1,\ldots,A_k$是$G$的子集的集合,使得$G=A_1\ldots A_k$是所有$A_i$与$|G|=|A_1|\ldots|A_k|$的乘积.我们写$G=A_1\cdot\ldots\cdot A_k$,并称之为$(|A_1|,\ldots,|A_k|)$形式的$G$的$k$ -折叠因式分解,或更简单地称为$G$的$(|A_1|,\ldots,|A_k|)$ -因式分解。令$k\geq2$为固定整数。如果$G$有一个$(a_1,\ldots,a_k)$ -因子分解,那么每当$|G|=a_1\ldots a_k$有$a_i>1$,$i=1,\ldots,k$时,我们说$G$是$k$ -可因子分解的.我们说$G$是多重可因子分解的,如果$G$对任何可能的整数$k\geq2$都是$k$ -可因子分解的。本文证明了在阶至多为$60$的群中,恰有$6$不可多重分解群。以下是它们的完整列表:$A_4$、$(C_2\times C_2)\rtimes C_9$、$A_4\times C_3$、$(C_2\times C_2\times C_2)\rtimes C_7$、$A_5$、$A_4\times C_5$。提出了一些相关的开放性问题。

英文摘要:

Let $G$ be a finite group and let $A_1,\ldots,A_k$ be a collection of subsets of $G$ such that $G=A_1\ldots A_k$ is the product of all the $A_i$'s with $|G|=|A_1|\ldots|A_k|$. We write $G=A_1\cdot\ldots\cdot A_k$ and call this a $k$-fold factorization of $G$ of the form $(|A_1|,\ldots,|A_k|)$ or more briefly an $(|A_1|,\ldots,|A_k|)$-factorization of $G$. Let $k\geq2$ be a fixed integer. If $G$ has an $(a_1,\ldots,a_k)$-factorization, whenever $|G|=a_1\ldots a_k$ with $a_i>1$, $i=1,\ldots,k$, we say that $G$ is $k$-factorizable. We say that $G$ is multifold-factorizable if $G$ is $k$-factorizable for any possible integer $k\geq2$. In this paper we prove that there are exactly $6$ non-multifold-factorizable groups among the groups of order at most $60$. Here is their complete list: $A_4$, $(C_2\times C_2)\rtimes C_9$, $A_4\times C_3$, $(C_2\times C_2\times C_2)\rtimes C_7$, $A_5$, $A_4\times C_5$. Some related open questions are presented.

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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