群G的一个子群H称为在G中具有半覆盖远离性,如果存在G的一个主群列1=G0〈G1〈…〈Gl=G,使得对每一i=1,…,l或者H覆盖Gj/Gj-1或者H远离Gj/Gj-1.本文证明了子群的半覆盖远离性是子群C-正规性和子群的覆盖远离性之推广.进一步应用极大子群和Sylow子群给出了有限群为可解群的一些特征.
A subgroup H is said to be semi cover-avoiding in a group G if there is a chief series 1 = G0 〈 G1 〈 …〈 Gl = G such that for every i = 1,...,l, either H covers Gj/Gj-1 or H avoids Gj/Gj-1. This paper shows that semi cover-avoidance is suitable to cover the both C-normality and the cover-avoidance property, and to characterize the solvability of groups by means of the maximal subgroups or Sylow subgroups.