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Date: 12-4-2022
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The graph complement of a graph hole. Graph antiholes are called even if they have an even number of vertices and odd if they have an odd number of vertices (Chvátal). No odd antihole is a perfect graph (since the clique number of an antihole with vertices is and its chromatic number is ).
Chvátal, V. "The Strong Perfect Graph Theorem." http://www.cs.concordia.ca/~chvatal/perfect/spgt.html.
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