On Q-spectral integral variation.
Electronic Notes in Discrete Mathematics, 35.
Let G be a graph with two non adjacent vertices and G0 the graph constructed
from G by adding an edge between them. It is known that the trace of Q0 is 2
plus the trace of Q, where Q and Q0 are the signless Laplacian matrices of G and
G0 respectively. So, the sum of the Q0-eigenvalues of G0 is the sum of the the Q-
eigenvalues of G plus two. It is said that Q-spectral integral variation occurs when
either only one Q-eigenvalue is increased by two or two Q-eigenvalues are increased
by 1 each one. In this article we present some conditions for the occurrence of
Q-spectral integral variation under the addition of an edge to a graph G.
||signless Laplacian matrix; Q-integral graph; Q-spectral integral variation;
||Science & Engineering > Mathematics
Professor Steve Kirkland
||14 Oct 2010 14:49
|Journal or Publication Title:
||Electronic Notes in Discrete Mathematics
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