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JOURNALS // Algebra and Discrete Mathematics // Archive

Algebra Discrete Math., 2009 Issue 4, Pages 66–77 (Mi adm144)

RESEARCH ARTICLE

Some properties of nilpotent groups

A. M. Gaglionea, S. Lipschutzb, D. Spellmanb

a Department of Mathematics U.S. Naval Academy Annapolis, MD 21402 USA
b partment of Mathematics Temple University Philadephia, PA 19122 USA

Abstract: Property S, a finiteness property which can hold in infinite groups, was introduced by Stallings and others and shown to hold in free groups. In [2] it was shown to hold in nilpotent groups as a consequence of a technical result of Mal'cev. In that paper this technical result was dubbed property R. Hence, more generally, any property R group satisfies propert S. In [7] it was shown that property R implies the following (labeled there weak property R) for a group G:
If $G_{0}$ is any subgroup in $G$ and $G_{0}^{*}$ is any homomorphic image of $G_{0}$, then the set of torsion elements in $G_{0}^{*}$ forms a locally finite subgroup.
It was left as an open question in [7] whether weak property R is equivalent to property R. In this paper we give an explicit counterexample thereby proving that weak property R is strictly weaker than property R.

Keywords: Property S, Property R, commensurable, variety of groups, closure operator.

MSC: 20F18, 20F05, 20F24, 16D10

Received: 23.05.2009
Revised: 23.05.2009

Language: English



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