if a planar 4 regular graph is only made of 3 and 4 corners and let´s say it has "s" a defined number of 4 corners then how van i find the number of 3 corners using the euler.P.formula . I saw online that it is the same number of 4 corners but with no proof. can anyone help ?
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Well, to use the Euler formula for planar graphs, you must know what is it. And what is it, really? – Ivan Neretin Jan 05 '24 at 23:20