PSL(2,Z)作为Thompson群T的非畸变子群
PSL(2,Z) as a non distorted subgroup of Thompson's group T
摘要:
本文用约化树偶图和分段线性映射刻画了Thompson群T的子群PSL(2,Z)的元素。实际上,我们为PSL(2,Z)的每个元素构造了规范型的约化树偶图。这使得我们可以通过PSL(2,Z)的约化树偶图的插入符号的数目来估计PSL(2,Z)的元素的长度,从而证明PSL(2,Z)是T的非畸变子群。特别地,我们找到了T的非扭曲自由非交换子群。
英文摘要:
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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