Finding a maximum-weight induced -partite subgraph of an -triangulated graph

Abstract: An -triangulated graph is a graph in which every odd cycle has two non-crossing chords; -triangulated graphs form a subfamily of perfect graphs. A slightly more general family of perfect graphs are clique-separable graphs. A graph is clique-separable precisely if every induced subgraph either has a clique cutset, or is a complete multipartite graph or a clique joined to an arbitrary bipartite graph. We exhibit a polynomial time algorithm for finding a maximum-weight induced -partite subgraph of an -triangulated graph, and show that the problem of finding a maximum-size bipartite induced subgraph in a clique-separable graph is -complete. [Copyright &y& Elsevier]