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.
法学会阅读。
有限
影响,得到幂
论（下）
持低于正常活动的慢性状态， 而没有任何明显的
完全崩溃的趋势。
