Results 51 to 60 of about 150 (120)

The signless Laplacian Estrada index of tricyclic graphs

open access: yes, 2014
The signless Laplacian Estrada index of a graph $G$ is defined as $SLEE(G)=\sum^{n}_{i=1}e^{q_i}$ where $q_1, q_2, \ldots, q_n$ are the eigenvalues of the signless Laplacian matrix of $G$. In this paper, we show that there are exactly two tricyclic graphs with the maximal signless Laplacian Estrada index.
Nasiri, R.   +4 more
openaire   +4 more sources

On sum of powers of Laplacian eigenvalues and Laplacian Estrada index of graphs

open access: yes, 2011
Let $G$ be a simple graph and $α$ a real number. The quantity $s_α(G)$ defined as the sum of the $α$-th power of the non-zero Laplacian eigenvalues of $G$ generalizes several concepts in the literature. The Laplacian Estrada index is a newly introduced graph invariant based on Laplacian eigenvalues.
openaire   +2 more sources

Maximum signless Laplacian Estrada index of tetracyclic graphs

open access: yesFilomat
In this study, we aim to determine the unique tetracyclic graph that maximizes the signless Laplacian Estrada index (SLEE) among all tetracyclic graphs. The SLEE of a graph ? is defined as the sum of the exponentials of its eigenvalues, expressed as follows: SLEE(?)=?n,i=1 esi, where s1, s2,...,sn are the eigenvalues of the signless Laplacian matrix ...
Palaniyappan Nithya   +3 more
openaire   +1 more source

Novel Bounds for the Normalized Laplacian Estrada and Normalized Energy Index of Graphs

open access: yes, 2015
For a simple and connected graph, several lower and upper bounds of graph invariants expressed in terms of the eigenvalues of the normalized Laplacian matrix have been proposed in literature. In this paper, through a unified approach based on majorization techniques, we provide some novel inequalities depending on additional information on the ...
Clemente, Gian Paolo   +1 more
openaire   +2 more sources

Network bypasses sustain complexity. [PDF]

open access: yesProc Natl Acad Sci U S A, 2023
Estrada E, Gómez-Gardeñes J, Lacasa L.
europepmc   +1 more source

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