Anderson, James W. and Reid, Alan W.
Commensurability of Fuchsian groups and their axes.
Proceedings of the American Mathematical Society, 125, (3), .
The purpose of this note is to prove the following Theorem. This answers a question raised during the problem session at the Special Session on Geometric Function Theory of the 898th meeting of the AMS in Hartford, CT, the weekend of the fourth of March, 1995, and is related to a question in Mess on whether equality of axis sets for Fuchsian groups implies commensurability.
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