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- Title
Some further bounds for the Q-index of nested split graphs.
- Authors
Anđelić, M.; Fonseca, C.; Simić, S.; Tošić, D.
- Abstract
The Q-index of a simple graph is the largest eigenvalue of its signless Laplacian, or Q-matrix. In our previous paper [] we gave three lower and three upper bounds for the Q-index of nested split graphs, also known as threshold graphs. In this paper, we give another two upper bounds, which are expressed as solutions of cubic equations (in contrast to quadratics from []). Some computational results are also included.
- Subjects
GRAPH theory; MATHEMATICAL bounds; PATHS &; cycles in graph theory; LAPLACIAN matrices; CUBIC equations; QUADRATIC equations; EIGENVALUES
- Publication
Journal of Mathematical Sciences, 2012, Vol 182, Issue 2, p193
- ISSN
1072-3374
- Publication type
Article
- DOI
10.1007/s10958-012-0739-x