The minimum signless Laplacian spectral radius of graphs with given independence number
β Scribed by Ruilin Li; Jinsong Shi
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 307 KB
- Volume
- 433
- Category
- Article
- ISSN
- 0024-3795
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β¦ Synopsis
The independence number Ξ±(G) of G is defined as the maximum cardinality of a set of pairwise non-adjacent vertices which is called an independent set. In this paper, we characterize the graphs which have the minimum spectral radius among all the connected graphs of order n with independence number Ξ±(G) β 1, 2, n 2 , n 2 + 1, n -2, n -3 .
π SIMILAR VOLUMES
Let G be a simple graph with vertices v 1 , v 2 , . . . , v n , of degrees = ) is called the signless Laplacian spectral radius or Q -spectral radius of G. Denote by Ο(G) the chromatic number for a graph G. In this paper, for graphs with order n, the extremal graphs with both the given chromatic num
In this paper, we show that among all the connected graphs with n vertices and k cut vertices, the maximal signless Laplacian spectral radius is attained uniquely at the graph G n,k , where G n,k is obtained from the complete graph K n-k by attaching paths of almost equal lengths to all vertices of
Let B(n, g) be the class of bicyclic graphs on n vertices with girth g. Let B 1 (n, g) be the subclass of B(n, g) consisting of all bicyclic graphs with two edge-disjoint cycles and B 2 (n, g) = B(n, g) \ B 1 (n, g). This paper determines the unique graph with the maximal Laplacian spectral radius a