Can't we make a face with just two edges(sides) and two vertices? We just connect those two vertices twice each with different edges and we can make a face between the two edges with only two vertices and edges like the image.
2026-03-26 06:06:48.1774505208
e <= 3v - 6 for planar graph question: why does every face (of a planar graph) have to have at least three sides?
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