A local characterization for perfect plane near-triangulations

preprint2020arXivOpen access

Abstract

We derive a local criterion for a plane near-triangulated graph to be perfect. It is shown that a plane near-triangulated graph is perfect if and only if it does not contain either a vertex, an edge or a triangle, the neighbourhood of which has an odd hole as its boundary. The characterization leads to an O(n2)O(n^2) algorithm for checking perfectness of plane near-triangulations.

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