Английская Википедия:Adjacency algebra

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In algebraic graph theory, the adjacency algebra of a graph G is the algebra of polynomials in the adjacency matrix A(G) of the graph. It is an example of a matrix algebra and is the set of the linear combinations of powers of A.[1]

Some other similar mathematical objects are also called "adjacency algebra".

Properties

Properties of the adjacency algebra of G are associated with various spectral, adjacency and connectivity properties of G.

Statement. The number of walks of length d between vertices i and j is equal to the (ij)-th element of Ad.[1]

Statement. The dimension of the adjacency algebra of a connected graph of diameter d is at least d + 1.[1]

Corollary. A connected graph of diameter d has at least d + 1 distinct eigenvalues.[1]

References

Шаблон:Reflist


Шаблон:Graph-stub

  1. 1,0 1,1 1,2 1,3 Algebraic graph theory, by Norman L. Biggs, 1993, Шаблон:ISBN, p. 9