Utilize este identificador para referenciar este registo:
http://hdl.handle.net/10773/27220
Título: | On the energy of singular and non singular graphs |
Autor: | Andrade, Enide Carmona, Juan R. Poveda, Alex Robbiano, María |
Palavras-chave: | Energy Singular graphs Non singular graphs |
Data: | 1-Jan-2020 |
Editora: | University of Kragujevac |
Resumo: | Let $G$ be a simple undirected graph with $n$ vertices, $m$ edges, adjacency matrix $A$, largest eigenvalue $\rho$ and nullity $\kappa$. The energy of $G,$ $\mathcal{E}(G)$ is the sum of its singular values. In this work lower bounds for $\mathcal{E}(G)$ in terms of the coefficient of $\mu^{\kappa}$ in the expansion of characteristic polynomial, $p(\mu)=\det{(\mu I-A)}$ are obtained. In particular one of the bounds generalizes a lower bound obtained by K. Das, S. A. Mojallal and I. Gutman in $2013$ to the case of graphs with given nullity. The bipartite case is also studied obtaining in this case, a sufficient condition to improve the spectral lower bound $2\rho.$ Considering an increasing sequence convergent to $\rho$ a convergent increasing sequence of lower bounds for the energy of $G$ is constructed. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/27220 |
DOI: | |
ISSN: | 0340-6253 |
Aparece nas coleções: | CIDMA - Artigos DMat - Artigos OGTCG - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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singularnonsingular.pdf | 251.17 kB | Adobe PDF | Ver/Abrir |
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