PSL(2,Z) as a non distorted subgroup of Thompson's group T

Details PSL(2,Z) as a non distorted subgroup of Thompson's group T PSL(2,Z) as a non distorted subgroup of Thompson's group T

2010-06-02

arxiv.org/abs/1006.0508v1

Mathematics

Group Theory

Scientific paper

In this paper we characterize the elements of PSL(2,Z), as a subgroup of Thompson group T, in the language of reduced tree pair diagrams and in terms of piecewise linear maps as well. Actually, we construct the reduced tree pair diagram for every element of PSL(2,Z) in normal form. This allows us to estimate the length of the elements of PSL(2,Z) through the number of carets of their reduced tree pair diagrams and, as a consequence, to prove that PSL(2,Z) is a non distorted subgroup of T. In particular, we find non-distorted free non abelian subgroups of T.

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