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math.GR2004
An ascending HNN extension of a free group inside SL(2,C)
Danny Calegari, Nathan M. Dunfield
We give an example of a subgroup of SL(2,C) which is a strictly ascending HNN extension of a non-abelian finitely generated free group F. In particular, we exhibit a free group F i…
math.GR2003
Dynamical forcing of circular groups
Danny Calegari
In this paper we introduce and study the notion of dynamical forcing. Basically, we develop a toolkit of techniques to produce finitely presented groups which can only act on the c…