Question: Exercise 4 (Mantel's theorem. ) Let I = (V, E, 4) be a simple graph that does not have complete subgraphs with 3 vertices (no

Exercise 4 (Mantel's theorem. ) Let I = (V, E, 4) be a simple graph that does not have complete subgraphs with 3 vertices (no "triangles"). Let n = #V. Prove that #E

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