The Euler Characteristic of an Orbifold (Geometry and the Imagination)
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|Conway, Doyle, Gilman, Thurston; The Geometry Center|
|Suppose we have a symmetric pattern in the plane. We can make a symmetric map by subdividing the quotient orbifold into polygons, and then 'unrolling it' or 'unfolding it' to get a map in the plane...|
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