Proving Euler's Polyhedral Formula by Deleting Edges
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For a polyhedron P, let V be the number of vertices, E the number of edges, and F the number of faces. Then Euler's polyhedral formula of 1752 is V-E+F=2. There are more than a dozen ways to prove this. Here is one such proof. First, cut P apart along e...
Contributed by: George Beck