Abstract
We study the Veech group of an origami, i.e., of a translation surface, tessellated by parallelograms. We show that it is isomorphic to the image of a certain subgroup of {\small $\aut^+(F_2)$ in $\slzwei(\ZZ) \cong \out^+(F_2)$}. Based on this, we present an algorithm that determines the Veech group.
Citation
Gabriela Schmithüsen. "An Algorithm for Finding the Veech Group of an Origami." Experiment. Math. 13 (4) 459 - 472, 2004.
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