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arXiv 1307.2175math.GRmath.COmath.RT
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素图正则的有限群

Finite groups whose prime graphs are regular

Hung P. Tong-Viet

摘要:

设G是有限群,Irr(G)是G的所有不可约复特征标的集合.设cd(G)是G的所有特征标度的集合,ρ(G)表示能整除G的某些特征标度的素数的集合.与G相关联的素图Δ(G)是顶点集为ρ(G)且两个不同素数p和q之间存在边的图当且仅当乘积pq整除G的某个特征度数。本文证明了有限群G的素图Δ(G)是3-正则的当且仅当它是四顶点完全图.

英文摘要:

Let G be a finite group and let Irr(G) be the set of all irreducible complex characters of G. Let cd(G) be the set of all character degrees of G and denote by ρ(G) the set of primes which divide some character degrees of G. The prime graph Δ(G) associated to G is a graph whose vertex set is ρ(G) and there is an edge between two distinct primes p and q if and only if the product pq divides some character degree of G. In this paper, we show that the prime graph Δ(G) of a finite group G is 3-regular if and only if it is a complete graph with four vertices.

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