Some results on the signless Laplacians of graphs |
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| Authors: | Jianfeng Wang Qiongxiang Huang Xinhui An Francesco Belardo |
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| Institution: | 1. Department of Mathematics, Qinghai Normal University, Xining, Qinghai 810008, PR China;2. College of Mathematics and System Science, Xinjiang University, Urumqi 830046, PR China;3. Department of Mathematics, University of Messina, 98166 Sant’Agata, Messina, Italy |
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| 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. |
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