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EnglishIn this paper we give two results concerning the signless Laplacian spectra of simple graphs. Firstly, we give a combinatorial expression for the fourth coefficient of the (signless Laplacian) characteristic polynomial of a graph. Secondly, we consider limit points for the (signless Laplacian) eigenvalues and we prove that each non-negative real number is a limit point for (signless Laplacian) eigenvalue of graphs. (C) 2010 Elsevier Ltd. All rights reserved.
| Titolo: | Some results on the signless Laplacians of graphs |
| Autori: | |
| Data di pubblicazione: | 2010 |
| Rivista: | |
| Abstract: | In this paper we give two results concerning the signless Laplacian spectra of simple graphs. Firstly, we give a combinatorial expression for the fourth coefficient of the (signless Laplacian) characteristic polynomial of a graph. Secondly, we consider limit points for the (signless Laplacian) eigenvalues and we prove that each non-negative real number is a limit point for (signless Laplacian) eigenvalue of graphs. (C) 2010 Elsevier Ltd. All rights reserved. |
| Handle: | http://hdl.handle.net/11570/1904156 |
| Appare nelle tipologie: | 14.a.1 Articolo su rivista |
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