Theorem 1 (Euler's polyhedron formula) V-E+F=2. Corollary 1 [2, p. 104]
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![Planar Graphs Hubert Chan (Chapter 9.7) [O2 Proof Techniques] - ppt download](https://slideplayer.com/slide/12749802/77/images/6/Euler%E2%80%99s+Formula+for+Planar+Graphs.jpg "Planar Graphs Hubert Chan (Chapter 9.7) [O2 Proof Techniques] - ppt download")
Planar Graphs Hubert Chan (Chapter 9.7) [O2 Proof Techniques] - ppt download
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