M p -supplemented subgroups of finite groups

Abstract

A subgroup K of G is Mp-supplemented in G if there exists a subgroup B of G such that G = KB and TB < G for every maximal subgroup T of K with |K: T| = pα. In this paper we prove the following: Let p be a prime divisor of |G| and let H be ap-nilpotent subgroup having a Sylow p-subgroup of G. Suppose that H has a subgroup D with Dp ≠ 1 and |H: D| = pα. Then G is p-nilpotent if and only if every subgroup T of H with |T| = |D| is Mp-supplemented in G and NG(Tp)/CG(Tp) is a p-group.