Algebraic Connectivity and Degree Sequences of Trees

We investigate the structure of trees that have minimal algebraic connectivity among all trees with a given degree sequence. We show that such trees are caterpillars and that the vertex degrees are non-decreasing on every path on non-pendant vertices starting at the characteristic set of the Fiedler vector. (author´s abstract)

[1]  Bryan L. Shader,et al.  Characteristic vertices of weighted trees via perron values , 1996 .

[2]  M. Fiedler Algebraic connectivity of graphs , 1973 .

[3]  Dr. M. G. Worster Methods of Mathematical Physics , 1947, Nature.

[4]  J. Leydold,et al.  Laplacian eigenvectors of graphs : Perron-Frobenius and Faber-Krahn type theorems , 2007 .

[5]  J. Leydold,et al.  Discrete Nodal Domain Theorems , 2000, math/0009120.

[6]  Shaun M. Fallat,et al.  Extremizing algebraic connectivity subject to graph theoretic constraints , 1998 .

[7]  Gordon F. Royle,et al.  Algebraic Graph Theory , 2001, Graduate texts in mathematics.

[8]  Steve Kirkland,et al.  Algebraic connectivity of weighted trees under perturbation , 1997 .

[9]  D. Avis,et al.  Graph theory and combinatorial optimization , 2005 .

[10]  Ravindra B. Bapat,et al.  Algebraic connectivity and the characteristic set of a graph , 1998 .

[11]  Regina Tyshkevich,et al.  Lectures on Graph Theory , 1994 .

[12]  Jia-Yu Shao,et al.  The ordering of trees and connected graphs by algebraic connectivity , 2008 .

[13]  P. Hansen,et al.  Variable Neighborhood Search for Extremal Graphs. XI. Bounds on Algebraic Connectivity , 2004 .

[14]  C. Brand,et al.  Characterization of Trivalent Graphs with Minimal Eigenvalue Gap , 2007 .

[15]  Peter F. Stadler,et al.  Laplacian Eigenvectors of Graphs , 2007 .

[16]  J. Friedman Some geometric aspects of graphs and their eigenfunctions , 1993 .

[17]  Claude Berge,et al.  Lectures on graph theory , 1967 .

[18]  M. Fiedler A property of eigenvectors of nonnegative symmetric matrices and its application to graph theory , 1975 .

[19]  N. Abreu Old and new results on algebraic connectivity of graphs , 2007 .