The GewirtzGraph command creates the Gewirtz graph.

The Gewirtz graph is a 22-regular graph with 56 vertices and 280 edges.

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

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

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

$G≔\mathrm{Graph\; 1:\; an\; undirected\; graph\; with\; 56\; vertices\; and\; 280\; edge(s)}$

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

$\mathrm{true},\left[10\,0\,2\right]$

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

$4$

"Gewirtz graph", Wikipedia. http://en.wikipedia.org/wiki/Gewirtz_graph

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

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