有限群的分解问题

G. Bergman
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引用次数: 6

摘要

在Kourovka Notebook的问题19.35中,M. H. Hooshmand问,给定一个有限群$G$和一个因式分解$\ mathm {card}(G)= n_1\ldots n_k$,是否总能找到$G$的子集$A_1,\ldots,A_k$,使得$G=A_1\ldots A_k$;$等价地,使得$A_1\ ldots\乘以A_k\到G$的群乘法映射$A_1\ ldots\乘以A_k$是双射。我们证明了对于4个元素的交替群$G$, $k=3$和$(n_1,n_2,n_3) =(2,3,2)$,答案是负的。然后,我们推广了证明中使用的一些工具,并注意到一个开放的问题。
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A note on factorizations of finite groups
In Question 19.35 of the Kourovka Notebook, M. H. Hooshmand asks whether, given a finite group $G$ and a factorization $\mathrm{card}(G)= n_1\ldots n_k$, one can always find subsets $A_1,\ldots,A_k$ of $G$ with $\mathrm{card}(A_i)=n_i$ such that $G=A_1\ldots A_k;$ equivalently, such that the group multiplication map $A_1\times\ldots\times A_k\to G$ is a bijection. We show that for $G$ the alternating group on 4 elements, $k=3$, and $(n_1,n_2,n_3) = (2,3,2)$, the answer is negative. We then generalize some of the tools used in our proof, and note an open question.
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