Dear all,

again I need your help for the following two questions: Suppose we have a triangle group of signature (p,q,\infty).

1. When is such a group unique (up to isomorphism)?
2. Do you a method how to calculate the trace field of such a group?

Thank you very much for your answer Ali

Dear all,

again I need your help for the following two questions: Suppose we have a triangle group of signature (p,q,\infty).

1. When is such a group unique (up to isomorphism)?
2. Do you have a method how to calculate the trace field of such a group? Is the trace field unique?

Thank you very much for your answer Ali