Clique-width of graphs defined by one-vertex extensions |
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Authors: | Michaël Rao |
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Institution: | LIRMM - CNRS, Université Montpellier 2, 161 rue Ada, 34392 Montpellier Cedex 5, France |
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Abstract: | Let G be a graph and u be a vertex of G. We consider the following operation: add a new vertex v such that v does not distinguish any two vertices which are not distinguished by u. We call this operation a one-vertex extension. Adding a true twin, a false twin or a pendant vertex are cases of one-vertex extensions. Here we are interested in graph classes defined by a subset of allowed one-vertex extension. Examples are trees, cographs and distance-hereditary graphs. We give a complete classification of theses classes with respect to their clique-width. We also introduce a new graph parameter called the modular-width, and we give a relation with the clique-width. |
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Keywords: | Graph classes Vertex extension Cographs Distance-hereditary graphs Clique-width |
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