Abstract：Supppose that G is a finite group and H is a subgroup og G.H is called S-semipermutable in G if for any Sylow p-subgroup of G satisfying;H is called c-normal in G if there exists a normal subgroup T of G such that G=HT,H∩T≤HG,where HG is the G-core of H
2008, Vol. 32 