Wong graph

In the mathematical field of graph theory, the Wong graph is a 5-regular undirected graph with 30 vertices and 75 edges. It is one of the four (5,5)-cage graphs, the others being the Foster cage, the Meringer graph, and the Robertson–Wegner graph.

Like the unrelated Harries–Wong graph, it is named after Pak-Ken Wong.

It has chromatic number 4, diameter 3, and is 5-vertex-connected.

Algebraic properties
The characteristic polynomial of the Wong graph is
 * $$(x-5)(x+1)^2(x^2-5)^3(x-1)^5(x^2+x-5)^8.$$