The SchlaefliGraph command creates the Schläfli graph.

The Schläfli graph is a 16-regular graph with 27 vertices and 216 edges.

$\mathrm{with}\left(\mathrm{GraphTheory}\right)\:$

$\mathrm{with}\left(\mathrm{SpecialGraphs}\right)\:$

$G≔\mathrm{SchlaefliGraph}\left(\right)$

$G≔\mathrm{Graph\; 1:\; an\; undirected\; graph\; with\; 27\; vertices\; and\; 216\; edge(s)}$

$\mathrm{IsStronglyRegular}\left(G\,'\mathrm{parameters}'\right)$

$\mathrm{true},\left[16\,10\,8\right]$

$\mathrm{ChromaticNumber}\left(G\right)$

$9$

"Schläfli graph", Wikipedia. http://en.wikipedia.org/wiki/Schläfli_graph

The GraphTheory[SpecialGraphs][SchlaefliGraph] command was introduced in Maple 2020.

For more information on Maple 2020 changes, see Updates in Maple 2020.