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math.DG2009★ 12 cited
Veech groups of Loch Ness monsters
Piotr Przytycki, Gabriela Schmithuesen, Ferran Valdez
We classify Veech groups of tame non-compact flat surfaces. In particular we prove that all countable subgroups of avoiding the set of mappings of norm less t…
math.DS2009★ 5 cited
Veech groups, irrational billiards and stable abelian differentials
Ferran Valdez
We describe Veech groups of flat surfaces arising from irrational angled polygonal billiards or irreducible stable abelian differentials. For irrational polygonal billiards, we pro…