G的一个子群H称为在G中弱拟正规,如果对G的任意子群K,至少存在一个K的共轭子群K^x,x∈G,使得HK^x=K^xH。利用弱拟正规子群的概念,本文得到了关于有限群的幂零性的一些新刻画,给出了幂零群的一些充要条件。
Based on the definition and description of weakly quasinormal subgroup, some new criteria of nilpotency of finite groups were worked out under the assumptions that the groups contain some kinds of weakly quasinormal subgroups. Some necessary and sufficient conditions of nilpotent group were given.