construct Doyle graph
The DoyleGraph() command returns the Doyle graph, also known as the Holt graph, an undirected graph with 27 vertices and 54 edges.
G≔Graph 1: an undirected unweighted graph with 27 vertices and 54 edge(s)
"Doyle graph", Wikipedia. http://en.wikipedia.org/wiki/Doyle_graph
The GraphTheory[SpecialGraphs][DoyleGraph] command was introduced in Maple 2018.
For more information on Maple 2018 changes, see Updates in Maple 2018.
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