construct Poussin graph
The PoussinGraph() command returns the Poussin graph, a planar undirected graph with 15 vertices and 39 edges.
The Poussin graph was discovered by Charles Jean de la Vallée-Poussin as a counterexample to an incorrect proof of the four color theorem.
G≔Graph 1: an undirected unweighted graph with 15 vertices and 39 edge(s)
"Poussin graph", Wikipedia. http://en.wikipedia.org/wiki/Poussin_graph
The GraphTheory[SpecialGraphs][PoussinGraph] command was introduced in Maple 2018.
For more information on Maple 2018 changes, see Updates in Maple 2018.
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