supported by National Natural Science Foundation of China (Grant No.11071150);Natural Science Foundation of Shanxi Province (Grant No. 2008012001);The Returned Abroad-student Foundation of Shanxi Province (Grant No. [2007]13-56)
Let G be a group of order pn, p a prime. For 0 m n, sm(G) denotes the number of subgroups of order pm of G. Loo-Keng Hua and Hsio-Fu Tuan had ever conjectured: for an arbitrary finite p-group G, if p > 2, then sm(G) ...
supported by National Natural Science Foundation of China (Grant No.11071150);Natural Science Foundation of Shanxi Province (Grant No. 2008012001);The Returned Abroad-student Found of Shanxi Province (Grant No. [2007]13–56)
A subgroup A of a p-group G is said to be soft in G if CG(A) = A and |NG(A)/A| = p. In this paper we determined finite p-groups all of whose maximal abelian subgroups are soft; see Theorem A and Proposition 2.4.