The <a href="https://en.wikipedia.org/wiki/V%C3%A1clav_Chv%C3%A1tal" class="extiw" title="en:Václav Chvátal">Chvátal</a> graph, a 4-<a href="https://en.wikipedia.org/wiki/Regular_graph" class="extiw" title="en:Regular graph">regular</a> 4-<a href="https://en.wikipedia.org/wiki/Graph_coloring" class="extiw" title="en:Graph coloring">chromatic</a> <a href="https://en.wikipedia.org/wiki/Girth_(graph_theory)" class="extiw" title="en:Girth (graph theory)">girth</a>-4 graph.
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
<span class="int-own-work" lang="en">Own work</span>