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Almost simple groups with no product of two primes dividing three character degrees

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Abstract Let Irr⁡(G){\operatorname{Irr}(G)} denote the set of complex irreducible characters of a finite group G, and let cd⁡(G){\operatorname{cd}(G)} be the set of degrees of the members of Irr⁡(G){\operatorname{Irr}(G)}. For positive… Click to show full abstract

Abstract Let Irr⁡(G){\operatorname{Irr}(G)} denote the set of complex irreducible characters of a finite group G, and let cd⁡(G){\operatorname{cd}(G)} be the set of degrees of the members of Irr⁡(G){\operatorname{Irr}(G)}. For positive integers k and l, we say that the finite group G has the property 𝒫kl{\mathcal{P}^{l}_{k}} if, for any distinct degrees a1,a2,…,ak∈cd⁡(G){a_{1},a_{2},\dots,a_{k}\in\operatorname{cd}(G)}, the total number of (not necessarily different) prime divisors of the greatest common divisor gcd⁡(a1,a2,…,ak){\gcd(a_{1},a_{2},\dots,a_{k})} is at most l-1{l-1}. In this paper, we classify all finite almost simple groups satisfying the property 𝒫32{\mathcal{P}_{3}^{2}}. As a consequence of our classification, we show that if G is an almost simple group satisfying 𝒫32{\mathcal{P}_{3}^{2}}, then |cd⁡(G)|⩽8{\lvert\operatorname{cd}(G)\rvert\leqslant 8}.

Keywords: groups product; two primes; almost simple; product two; simple groups; group

Journal Title: Journal of Group Theory
Year Published: 2019

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