Let the soluble-by-finite group G = AB = AC = BC be the product of two nilpotent subgroups A and B and a subgroup C. It is shown that, if G has finite abelian section rank and C is hypercentral (hypercyclic), then G is hypercentral (hypercyclic). Moreover, if G is an L 1-group and C is nilpotent, then G is nilpotent.
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Univ Alabama, Dept Math, Tuscaloosa, AL 35487 USAUniv Alabama, Dept Math, Tuscaloosa, AL 35487 USA
Dixon, M. R.
Ferrara, M.
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Univ Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, I-80126 Naples, ItalyUniv Alabama, Dept Math, Tuscaloosa, AL 35487 USA
Ferrara, M.
Karatas, Z. Y.
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Univ Cincinnati, Blue Ash Coll, Math Phys & Comp Sci Dept, Blue Ash, OH 45236 USAUniv Alabama, Dept Math, Tuscaloosa, AL 35487 USA
Karatas, Z. Y.
Trombetti, M.
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Univ Napoli Federico II, Dipartimento Matemat & Applicaz, Complesso Univ Monte S Angelo,Via Cintia, I-80126 Naples, ItalyUniv Alabama, Dept Math, Tuscaloosa, AL 35487 USA