construct Mirzakhani graph
The MirzakhaniGraph() command returns the Mirzakhani graph, a 3-colorable planar graph with 63 vertices which is not 4-choosable.
The Mirzakhani graph is the smallest known graph satisfying these properties and was discovered by Maryam Mirzakhani in 1996.
G≔Graph 1: an undirected unweighted graph with 63 vertices and 183 edge(s)
Mirzakhani, Maryam. A small non-4-choosable planar graph. Bull. Inst. Combin. Appl. 17 (1996), 15–18.
The GraphTheory[SpecialGraphs][MirzakhaniGraph] command was introduced in Maple 2018.
For more information on Maple 2018 changes, see Updates in Maple 2018.
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