Coordinates for Teichm\"{u}ller spaces of b-groups with torsion

Abstract

In this paper we will use b-groups to construct coordinates for the Teichm\"uller spaces of 2-orbifolds. The main technical tool is the parametrization of triangle groups, which allows us to compute explicitly formul\ae\ for generators of b-groups uniformizing orbifolds. In this way, we obtain a technique to pass from the abstract objects of deformation spaces to concrete calculations with M\"obius transformations. We explore this computational character of our work by finding the expressions of certain classical isomorphisms between Teichm\"uller spaces.