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math.AG2016
On the involution of the real line induced by Dyer's outer automorphism of PGL(2,Z)
A. Muhammed Uludağ, Hakan Ayral
We study the involution of the real line induced by the outer automorphism of the extended modular group PGL(2,Z). This `modular' involution is discontinuous at rationals but satis…
math.AG2015
Fundamental Groups of a Class of Rational Cuspidal Plane Curves
A. Muhammed Uludağ
We compute the presentations of fundamental groups of the complements of a class of rational cuspidal projective plane curves classified by Flenner, Zaidenberg, Fenske and Saito. W…