arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.3248math.CO
收藏

部分拉丁方的自同构集

The set of autotopisms of partial Latin squares

R. M. Falcón

摘要:

部分拉丁方的对称性由它的自拓扑群决定。类似于拉丁方的情况,给定一个合痕$Θ$,在$Θ$下不变的部分拉丁方的集合$\mathcal{PLS}_Θ$的基数只取决于后者的共轭类,或者等价地,取决于它的循环结构。本文刻画了部分拉丁方的自映射集的圈结构,并研究了几个相关性质。还可以看出,$Θ$的循环结构决定了$\mathcal{PLS}_Θ$的元素的可能大小以及具有给定大小的该集合的部分拉丁方的数量。最后,将部分拉丁方可补的传统概念推广到一个拉丁方.

英文摘要:

Symmetries of a partial Latin square are determined by its autotopism group. Analogously to the case of Latin squares, given an isotopism $Θ$, the cardinality of the set $\mathcal{PLS}_Θ$ of partial Latin squares which are invariant under $Θ$ only depends on the conjugacy class of the latter, or, equivalently, on its cycle structure. In the current paper, the cycle structures of the set of autotopisms of partial Latin squares are characterized and several related properties studied. It is also seen that the cycle structure of $Θ$ determines the possible sizes of the elements of $\mathcal{PLS}_Θ$ and the number of those partial Latin squares of this set with a given size. Finally, it is generalized the traditional notion of partial Latin square completable to a Latin square.

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。

↑