Considering the subnormal subgroups,some equivalent conditions for nilpotency of finite groups are given and a sufficient condition for nilpotency of finite groups is obtained.
Indeed it seems capable of remaining in a chronic condition of subnormal activity for a considerable period without any marked tendency either towards recovery or towards complete collapse.
。
究次
有限群结构的
,
到幂零群的若干等价条件和一个充分条件。
论（下）
持
完全崩溃的趋势。
