-тождества и -многообразия
-тождества нильпотентных групп. I
-тождества нильпотентных групп. II
Groups all whose nonnormal subgroups generate a nontrivial proper subgroup.
Groups in which the derived groups of all 2-generator subgroups are cyclic
Groups preserving the cardinality of subsets product under permutations
Groups which are isomorphic to their nonabelian subgroups
Groups with many nearly normal subgroups
Un sottogruppo di un gruppo si dice nearly normal se ha indice finito nella sua chiusura normale . In questa nota si caratterizzano i gruppi in cui ogni sottogruppo che non sia nearly normal soddisfa una fissata condizione finitaria per diverse scelte naturali della proprietà .
Groups with nearly modular subgroup lattice
A subgroup H of a group G is nearly normal if it has finite index in its normal closure . A relevant theorem of B. H. Neumann states that groups in which every subgroup is nearly normal are precisely those with finite commutator subgroup. We shall say that a subgroup H of a group G is nearly modular if H has finite index in a modular element of the lattice of subgroups of G. Thus nearly modular subgroups are the natural lattice-theoretic translation of nearly normal subgroups. In this article we...
Groups with Restricted Non-Normal Subgroups.
Gruppi che sono unione di un numero finito di laterali doppi
Gruppi con pochi sottogruppi non quasinormali