arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1707.04643math.GR
收藏

群的集直接因子分解

Set-Direct Factorizations of Groups

Dan Levy, Attila Maróti

摘要:

我们考虑分解$G=XY$,其中$G$是一个一般的组,$X$和$Y$是正常的子集$G$和任何$g\in G$有一个独特的表示$g=xy$与$x\in X$和$y\in Y$。这个定义与有限阿贝尔群的子集的直积分解的习惯和广泛研究的定义相一致。我们的主要结果表明,一个群$G$有这样一个因式分解当且仅当$G$是$\left\langle X\right\rangle $和$\left\langle Y\right\rangle $的一个中心乘积,并且中心子群$\left\langle X\right\rangle \cap \left\langle Y\right\rangle $满足一定的阿贝尔因式分解条件。我们分析了一些特殊的情况,并给出了例子。特别地,单群没有非平凡的集直接因子分解。

英文摘要:

We consider factorizations $G=XY$ where $G$ is a general group, $X$ and $Y$ are normal subsets of $G$ and any $g\in G$ has a unique representation $g=xy$ with $x\in X$ and $y\in Y$. This definition coincides with the customary and extensively studied definition of a direct product decomposition by subsets of a finite abelian group. Our main result states that a group $G$ has such a factorization if and only if $G$ is a central product of $\left\langle X\right\rangle $ and $\left\langle Y\right\rangle $ and the central subgroup $\left\langle X\right\rangle \cap \left\langle Y\right\rangle $ satisfies certain abelian factorization conditions. We analyze some special cases and give examples. In particular, simple groups have no non-trivial set-direct factorization.

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。

↑