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Université de Fribourg

Infinite presentability of groups and condensation

Bieri, Robert ; Cornulier, Yves ; Guyot, Luc ; Strebel, Ralph

In: Journal of the Institute of Mathematics of Jussieu, 2014, vol. 13, no. 04, p. 811–848

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...