Abstract
LetG be ap-vertex planar graph having a representation in the plane with nontriangular facesF 1,F 2, …,F r. Letf 1,f 2, …,f r denote the lengths of the cycles bounding the facesF 1,F 2, …,F r respectively. LetC 3(G) be the number of cycles of length three inG. We give bounds onC 3(G) in terms ofp,f 1,f 2, …,f r. WhenG is 3-connected these bounds are bounds for the number of triangles in a polyhedron. We also show that all possible values ofC 3(G) between the maximum and minimum value are actually achieved.
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This research was supported in part by the U.S.A.F. Office of Scientific Research, Systems Command, under Grant AFOSR-76-3017 and the National Science Foundation under Grant ENG79-09724.
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Hakimi, S.L., Schmeichel, E.F. Bounds on the number of cycles of length three in a planar graph. Israel J. Math. 41, 161–180 (1982). https://doi.org/10.1007/BF02760664
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DOI: https://doi.org/10.1007/BF02760664