Ballester Bolinches, Adolfo; Esteban Romero, Ramón; Ragland, Matthew F.(Walter de Gruyter, 2007-03)
[EN] A finite group G is said to be a PST-group if, for subgroups H and K of G with H Sylow-permutable in K and K Sylow-permutable in G, it is always the case that H is Sylow-permutable in G. A group G is a T*-group if, ...
Ballester Bolinches, Adolfo; Esteban Romero, Ramón(Cambridge University Press, 2003-10)
[EN] Characterisations of finite groups in which normality is a transitive relation are presented
in the paper. We also characterise the finite groups in which every subgroup is either
permutable or coincides with its ...