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Infinite presentability of groups and condensation

Published online by Cambridge University Press:  02 January 2014

Robert Bieri
Affiliation:
Department of Mathematics, Johann Wolfgang Goethe-Universität Frankfurt, 60054 Frankfurt am Main, Germany ([email protected])
Yves Cornulier
Affiliation:
CNRS and Laboratoire de Mathématiques, Bâtiment 425, Université Paris-Sud 11, 91405 Orsay, France ([email protected])
Luc Guyot
Affiliation:
STI, EPFL, INN 238 Station 14, Lausanne 1015, Switzerland ([email protected])
Ralph Strebel
Affiliation:
Département de Mathématiques, Chemin du Musée 23, Université de Fribourg, 1700 Fribourg, Switzerland ([email protected])

Abstract

We describe various classes of infinitely presented groups that are condensation points in the space of marked groups. A well-known class of such groups consists of finitely generated groups admitting an infinite minimal presentation. We introduce here a larger class of condensation groups, called infinitely independently presentable groups, and establish criteria which allow one to infer that a group is infinitely independently presentable. In addition, we construct examples of finitely generated groups with no minimal presentation, among them infinitely presented groups with Cantor–Bendixson rank 1, and we prove that every infinitely presented metabelian group is a condensation group.

Type
Research Article
Copyright
©Cambridge University Press 2013 

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