NNSF of China (10471085)NSF of Shanxi Province of China (20011004)Key Proj. of Ministry of Education(02023)the Returned Overseas Students Foundation of Shanxi Province of China ([2004]7)
A subgroup H of a finite group G is called semipermutable if it is permutable with every subgroup K of G with (|H| |K|) = 1, and s-semipermutable if it is permutable with every Sylow p-subgroup of G with (p, |...