A characterization of claw-free CIS graphs and new results on the order of CIS graphs
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Publication:6311112
DOI10.1016/J.ENTCS.2019.08.003arXiv1812.05314WikidataQ113317430 ScholiaQ113317430MaRDI QIDQ6311112
Marisa Gutierrez, Liliana Alcón, Martin Milanič
Publication date: 13 December 2018
Abstract: A graph is CIS if every maximal clique interesects every maximal stable set. Currently, no good characterization or recognition algorithm for the CIS graphs is known. We characterize graphs in which every maximal matching saturates all vertices of degree at least two and use this result to give a structural, efficiently testable characterization of claw-free CIS graphs. We answer in the negative a question of Dobson, Hujdurovi'c, Milaniv{c}, and Verret [Vertex-transitive CIS graphs, European J. Combin. 44 (2015) 87-98] asking whether the number of vertices of every CIS graph is bounded from above by the product of its clique and stability numbers. On the positive side, we show that the question of Dobson et al. has an affirmative answer in the case of claw-free graphs.
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