Constructive Hopf's Theorem, or How to Untangle Closed Planar Curves (Classic Reprint) - Softcover

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Excerpt from Constructive Hopf's Theorem, or How to Untangle Closed Planar Curves

Transformation steps: checking if two polygons are equivalent is in itself a trivial process of keeping a cumulative sum of the angles turned. The key insight comes from putting the vertices on a circle, thereby reducing polygons to combinatorial objects (the cyclic permutation of their vertices around.

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