Groups with normality conditions for subgroups of infinite rank
De Falco, Maria (Università di Napoli Federico II. Dipartimento di Matematica e Applicazioni)
de Giovanni, Francesco (Università di Napoli Federico II. Dipartimento di Matematica e Applicazioni)
Musella, Carmela (Università di Napoli Federico II. Dipartimento di Matematica e Applicazioni)

Date:	2014
Abstract:	A well-known theorem of B. H. Neumann states that a group has finite conjugacy classes of subgroups if and only if it is central-by-finite. It is proved here that if G is a generalized radical group of infinite rank in which the conjugacy classes of subgroups of infinite rank are finite, then every subgroup of G has finitely many conjugates, and so G=Z(G) is finite. Corresponding results are proved for groups in which every subgroup of infinite rank has fiznite index in its normal closure, and for those in which every subgroup of infinite rank is finite over its core.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Almost normal subgroup ; Group of infinite rank
Published in:	Publicacions matemàtiques, Vol. 58, Núm. 2 (2014) , p. 331-340, ISSN 2014-4350

Adreça alternativa: https://raco.cat/index.php/PublicacionsMatematiques/article/view/287179
DOI: 10.5565/PUBLMAT_58214_16

10 p, 278.3 KB

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