Landau's theorem for p-blocks of p-solvable groups.
Large normal nilpotent subgroups of finite groups.
Lattices of partially local Fitting classes.
Lineare p-auflösbare Gruppen.
Local classes and pairwise mutually permutable products of finite groups.
Lokale Formationen endlicher Gruppen.
Los retículos de las clases de Schunck normales y de las clases derivadas.
All groups to be considered are finite. The main result of this paper is the following: the normal Schunck classes compose a complete and distributive lattice antiisomorphic to the lattice composed by the Derived classes (s. [5]). It begins with a first section of machinery which establishes that the Derived classes are precisely the classes of groups G such that every simple section of G appartains to a σ-closed class (s. 1.6) of simple groups; therefore the Derived classes are a natural generalization...