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 ?
2026-03-27 07:11:47.1774595507
planar 4 regular graph
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