Browsing Repositorio Ciencias by Author "Rada, J"

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On the multiplicity of the eigenvalues of a graph

De La Pena, JA; Rada, J (2007)

Given a graph G with characteristic polynomial p(t), we consider the ML-decomposition p(t) = q(1)(t)q(2)(t)(2) ... q(m)(t)(m), where each q(i)(t) is an integral polynomial and the roots of p(t) with multiplicity j are ...
Retarded regular graphs are regular or semiregular

De La Pena, JA; Gutman, I; Rada, J (2008)

A graph G is said to be retarded regular if there is a positive integral number s such that the number of walks of length s starting at vertices of G is a constant function. Regular and semiregular graphs are retarded ...

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