Estimation of the maximum multiplicity of an eigenvalue in terms of the vertex degrees of the graph of a matrix

Charles R. Johnson; Carlos Manuel Saiago

doi:10.13001/1081-3810.1070

Estimation of the maximum multiplicity of an eigenvalue in terms of the vertex degrees of the graph of a matrix

Charles R. Johnson, Carlos Manuel Saiago

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Abstract

The maximum multiplicity among eigenvalues of matrices with a given graph cannot generally be expressed in terms of the degrees of the vertices (even when the graph is a tree). Given are best possible lower and upper bounds, and characterization of the cases of equality in these bounds. A by-product is a sequential algorithm to calculate the exact maximum multiplicity by simple counting.

Original language	English
Pages (from-to)	27-31
Number of pages	5
Journal	Electronic Journal Of Linear Algebra
Volume	9
Issue number	3
DOIs	https://doi.org/10.13001/1081-3810.1070
Publication status	Published - Mar 2002

Keywords

Eigenvalues
Multiplicity
Symmetric matrix
Tree
Vertex degrees

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title = "Estimation of the maximum multiplicity of an eigenvalue in terms of the vertex degrees of the graph of a matrix",

abstract = "The maximum multiplicity among eigenvalues of matrices with a given graph cannot generally be expressed in terms of the degrees of the vertices (even when the graph is a tree). Given are best possible lower and upper bounds, and characterization of the cases of equality in these bounds. A by-product is a sequential algorithm to calculate the exact maximum multiplicity by simple counting.",

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KW - Eigenvalues

KW - Multiplicity

KW - Symmetric matrix

KW - Tree

KW - Vertex degrees

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