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math.NT2014
Modular Embeddings and Rigidity for Fuchsian Groups
Robert A. Kucharczyk
We prove a rigidity theorem for semi-arithmetic Fuchsian groups: If , are two semi-arithmetic lattices in virtually admitting modular embedd…
math.NT2012★ 8 cited
Enumerating Trees
Robert A. Kucharczyk
In this note we discuss trees similar to the Calkin-Wilf tree, a binary tree that enumerates all positive rational numbers in a simple way. The original construction of Calkin and…