On the generalized norms of finite groups
Abstract
The norm N(G)N(G) of a group GG is the intersection of the normalizers of all subgroups in GG. In this paper, the norm is generalized by studying on Sylow subgroups and ℋ-subgroups in finite groups which is denoted by C(G) and A(G), respectively. It is proved that the generalized norms A(G) and C(G) are all equal to the hypercenter of G.
Communicated by M. L. Lewis