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arXiv 1003.0156math.GRmath.CO
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模m整数上线性群与矩阵环交换图的直径

The diameters of commuting graphs of linear groups and matrix rings over the integers modulo m

Michael Giudici, Aedan Pope

摘要:

群G的可交换图记为Gamma(G),是顶点为G的非中心元素且两个不同顶点相邻的简单无向图当且仅当它们可交换.设Z_m是模m整数等价类的交换环.本文研究了GL(n,Z_m)的交换图的连通度和直径,从而证明了当Gamma(G)连通时,任何有限群G的直径(Gamma(G))存在一个泛上界的猜想.对于任意的合数m,证明了Gamma(GL(n,Z_m))与Gamma(M(n,Z_m))连通且diam(Gamma(GL(n,Z_m)= diam(Gamma(M(n,Z_m)= 3.对于素数m,由已有的结果得到了连通性的例子和连通时Gamma(GL(n,Z_m))和Gamma(M(n,Z_m))直径的绝对界.

英文摘要:

The commuting graph of a group G, denoted by Gamma(G), is the simple undirected graph whose vertices are the non-central elements of G and two distinct vertices are adjacent if and only if they commute. Let Z_m be the commutative ring of equivalence classes of integers modulo m. In this paper we investigate the connectivity and diameters of the commuting graphs of GL(n,Z_m) to contribute to the conjecture that there is a universal upper bound on diam(Gamma(G)) for any finite group G when Gamma(G) is connected. For any composite m, it is shown that Gamma(GL(n,Z_m)) and Gamma(M(n,Z_m)) are connected and diam(Gamma(GL(n,Z_m))) = diam(Gamma(M(n,Z_m))) = 3. For m a prime, the instances of connectedness and absolute bounds on the diameters of Gamma(GL(n,Z_m)) and Gamma(M(n,Z_m)) when they are connected are concluded from previous results.

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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