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Several quantitative characterizations of some specific groups

A. MohammadzadehAli Reza Moghaddamfar — 2017

Commentationes Mathematicae Universitatis Carolinae

Let G be a finite group and let π ( G ) = { p 1 , p 2 , ... , p k } be the set of prime divisors of | G | for which p 1 < p 2 < < p k . The Gruenberg-Kegel graph of G , denoted GK ( G ) , is defined as follows: its vertex set is π ( G ) and two different vertices p i and p j are adjacent by an edge if and only if G contains an element of order p i p j . The degree of a vertex p i in GK ( G ) is denoted by d G ( p i ) and the k -tuple D ( G ) = ( d G ( p 1 ) , d G ( p 2 ) , ... , d G ( p k ) ) is said to be the degree pattern of G . Moreover, if ω π ( G ) is the vertex set of a connected component of GK ( G ) , then the largest ω -number which divides | G | , is said to be an...

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