设G是有限群,s1(G)表示G的非次正规子群的不同阶的个数,s2(G)表示G的非S-拟正规子群的不同阶的个数.该文主要利用s1(G)和s2(G)研究群G的结构.
Let G be a finite group. We define s1 (G) and s2(G) as the number of different orders of non- subnormal subgroups and the number of different orders of non- S - quasinormal subgroups, respectively, In this paper, we mainly study the structure of finite groups by making use of s1 (G) and s2 (G).