The spectral radius and the maximum degree of irregular graphs
The electronic journal of combinatorics, Tome 14 (2007)
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Let $G$ be an irregular graph on $n$ vertices with maximum degree $\Delta$ and diameter $D$. We show that $$ \Delta-\lambda_1>{1\over nD}, $$ where $\lambda_1$ is the largest eigenvalue of the adjacency matrix of $G$. We also study the effect of adding or removing few edges on the spectral radius of a regular graph.
Sebastian M. Cioabă. The spectral radius and the maximum degree of irregular graphs. The electronic journal of combinatorics, Tome 14 (2007). doi: 10.37236/956
@article{10_37236_956,
author = {Sebastian M. Cioab\u{a}},
title = {The spectral radius and the maximum degree of irregular graphs},
journal = {The electronic journal of combinatorics},
year = {2007},
volume = {14},
doi = {10.37236/956},
zbl = {1122.05056},
url = {http://geodesic.mathdoc.fr/articles/10.37236/956/}
}
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