Errera graph

The Errera graph is a specific type of directed graph used primarily in the study of graph theory and combinatorics. Named after the mathematician Jean Errera, it serves as a counterexample in certain contexts, particularly in discussions about graph properties like connectivity, cycles, and path lengths. The Errera graph has the following characteristics: - It consists of 3 vertices and is structured in a particular way. - The graph is directed, meaning that the edges have a direction associated with them.