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Artículo de publicación ISIA b-coloring of a graph is a proper coloring such that every color class contains a vertex that is adjacent to all other color classes. The b-chromatic number of a graph , denoted by , is the maximum number such that admits a b-coloring with colors. A graph is called b-continuous if it admits a b-coloring with colors, for every , and b-monotonic if for every induced subgraph of , and every induced subgraph of . We investigate the b-chromatic number of graphs with stability number two. These are exactly the complements of triangle-free graphs, thus including all complements of bipartite graphs. The main results of this work are the following: (1) We characterize the b-colorings of a graph with stability number two in terms of matchings with no augmenting paths of length one or three. We derive that graphs with stability number two are b-continuous and b-monotonic. (2) We prove that it is NP-complete to decide whether the b-chromatic number of co-bipartite graph is at least a given threshold. (3) We describe a polynomial time dynamic programming algorithm to compute the b-chromatic number of co-trees. (4) Extending several previous results, we show that there is a polynomial time dynamic programming algorithm for computing the b-chromatic number of tree-cographs. Moreover, we show that tree-cographs are b-continuous and b-monotonic.UBACyT Grant
20020100100980
CONICET PIP
112-200901-00178
11220120100450CO
ANPCyT PICT (Argentina)
2012-1324
MathAmSud Project (Argentina-Brazil-Chile-France)
13MATH-0
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