Toroidal Wrapping
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A torus is frequently represented as square, with opposite edges identified. In particular, a segment passing through an edge continues on through the opposite edge. Here, each pair of points is connected by the shortest toroidal segment. Try to move the seven points so that no two segments intersect.
Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA
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"Toroidal Wrapping"
http://demonstrations.wolfram.com/ToroidalWrapping/
Wolfram Demonstrations Project
Published: March 7 2011