A snark is a nontrivial cubic graph with chromatic index 4.

The WatkinsSnark command creates a snark with 50 vertices.

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

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

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

$G≔\mathrm{Graph\; 1:\; an\; undirected\; graph\; with\; 50\; vertices\; and\; 75\; edge(s)}$

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

The GraphTheory[SpecialGraphs][WatkinsSnark] command was introduced in Maple 2021.

For more information on Maple 2021 changes, see Updates in Maple 2021.