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.
。
究次正规子群
有限群结构的
,
到幂零群的若干等价条件和一个充分条件。
相当长的一段时间内
持低于正常活动的慢
， 而没有任何明显的恢复或完全崩溃的趋势。
