Published online by Cambridge University Press: 05 July 2011
Abstract
Let π be a set of primes. Generalizing the properties of Sylow p-subgroups, P.Hall introduced classes Eπ, Cπ, and Dπ of finite groups possessing a π-Hall subgroup, possessing exactly one class of conjugate π-Hall subgroups, and possessing one class of conjugate maximal π-subgroups respectively. In this paper we discuss a description of these classes in terms of a composition and a chief series of a finite group G.
Introduction
In 1872, the Norwegian mathematician L. Sylow proved the following outstanding theorem.
Theorem 1.1 (L. Sylow [76])Let G be a finite group and p a prime. Assume |G| = pαm and (p, m) = 1. Then the following statements hold:
(E) G possesses a subgroup of order pα (the, so-called, Sylow p-subgroup);
(C) every two Sylow p-subgroups of G are conjugate;
(D) every p-subgroup of G is included in a Sylow p-subgroup.
A natural generalization of the concept of Sylow p-subgroups is the notion of π-Hall subgroups. We recall the definitions. Let G be a finite group and π be a set of primes. We denote by π′ the set of all primes not in π, by π(n) the set of all prime divisors of a positive integer n and for a finite group G we denote π(|G|) by π(G). A positive integer n with π(n) ⊆ π is called a π-number and a group G with π(G) ⊆ π is called a π-group.
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