Article ID Journal Published Year Pages File Type
4600852 Linear Algebra and its Applications 2012 6 Pages PDF
Abstract

We investigate the family of graphs with many large eigenvalues. It is not hard to see that every graph with many vertices of large degree that are pairwise at distance at least four from each other, has many large eigenvalues. We show that this does not hold if the vertices of large degree are at mutual distance three from each other. We explore this class of graphs further and provide some bounds on their eigenvalues.

Related Topics
Physical Sciences and Engineering Mathematics Algebra and Number Theory