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math.GR2005★ 1 cited
Counting overlattices in automorphism groups of trees
Seonhee Lim
We give an upper bound for the number of ``overlattices'' in the automorphism group of a tree, containing a fixed lattice with index n. For an example of a lattice in the automorph…
math.GR2004
A dual braid monoid for the free group
David Bessis
We construct a quasi-Garside monoid structure for the free group. This monoid should be thought of as a dual braid monoid for the free group, generalising the constructions by Birm…
math.GR2002
On dense free subgroups of Lie groups
Emmanuel Breuillard, Tsachik Gelander
We give a method for constructing dense and free subgroups in real Lie groups. In particular we show that any dense subgroup of a connected semisimple real Lie group G contains a f…