The graph whose vertices are two-element subsets of a five-element set, with two vertices adjacent when the subsets are disjoint. It has ten vertices, degree three, zero common neighbours for adjacent pairs and one for nonadjacent pairs. Its adjacency matrix of a graph satisfies and has eigenvalues of multiplicities .
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The Petersen graph is a well-known and important object in the field of graph theory. It is a specific undirected graph that has several interesting properties. Here are some key features of the Petersen graph: 1. **Vertices and Edges**: The Petersen graph consists of 10 vertices and 15 edges.