Semigroups whose proper subsemigroups are quasicommutative.
Solvable groups with many BFC-subgroups.
We characterize the solvable groups without infinite properly ascending chains of non-BFC subgroups and prove that a non-BFC group with a descending chain whose factors are finite or abelian is a Cernikov group or has an infinite properly descending chain of non-BFC subgroups.
Some commutativity criteria
Some commutativity criteria. - II
Spaces whose only finite-sheeted covers are themselves. I.
Structure of a group with elements of order at most 4.
Structure of group invariants of a quasiperiodic flow.
Su una classe di gruppi con molti sottogruppi quasinormali
Subgroups and normal subgroups as systems of ideals
Sui gruppi finiti i cui sottogruppi non normali hanno tutti lo stesso ordine
Sia un gruppo non abeliano né hamiltoniano, ed un intero . Si dice che appartiene a se tutti i sottogruppi non normali di hanno ordine . Sia un numero primo. In questa Nota vengono determinati: 1) tutti i -gruppi in (Teoremi 1 e 2); 2) tutti i -gruppi in per e (Teorema 3); 3) tutti i gruppi di esponente appartenenti ad (Teorema 4).
S-полные группы, SR- группы, SD- группы
The classification of groups in which every product of four elements can be reordered
The divisible radical of a group
We consider the existence or otherwise of canonical divisible normal subgroups of groups in general. We present more counterexamples than positive results. These counterexamples constitute the substantive part of this paper.
Transitivité pour une certaine normalité faible dans un groupe.
Una nota sui gruppi dotati di un automorfismo uniforme di ordine potenza di un primo
Автоморфно факторизуемые группы.
Группы с C-замкнутыми нециклическими подгруппами
Группы с конечно вложенной инволюцией
Группы типа Миллера-Морено.
Два признака непростоты групп с бесконечно изолированной подгруппой.