Disconnected cuts in claw-free graphs

Martin, B.; Paulusma, D.; van Leeuwen, E.J.

Abstract

A disconnected cut of a connected graph is a vertex cut that itself also induces a disconnected subgraph. The corresponding decision problem is called Disconnected Cut. This problem is known to be NP-hard on general graphs. We prove that it is polynomial-time solvable on claw-free graphs, answering a question of Ito et al. (TCS 2011). The basis for our result is a decomposition theorem for claw-free graphs of diameter 2, which we believe is of independent interest and builds on the research line initiated by Chudnovsky and Seymour (JCTB 2007–2012) and Hermelin et al. (ICALP 2011). On our way to exploit this decomposition theorem, we characterize how disconnected cuts interact with certain cobipartite subgraphs, and prove two further algorithmic results, namely that Disconnected Cut is polynomial-time solvable on circular-arc graphs and line graphs.

Citation

Martin, B., Paulusma, D., & van Leeuwen, E. (2020). Disconnected cuts in claw-free graphs. Journal of Computer and System Sciences, 113, 60-75. https://doi.org/10.1016/j.jcss.2020.04.005

• Journal Article Type: Article
• Acceptance Date: Apr 2, 2020
• Online Publication Date: May 11, 2020
• Publication Date: Nov 30, 2020
• Deposit Date: Apr 26, 2020
• Publicly Available Date: May 11, 2021
• Journal: Journal of Computer and System Sciences
• Print ISSN: 0022-0000
• Electronic ISSN: 1090-2724
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 113
• Pages: 60-75
• DOI: https://doi.org/10.1016/j.jcss.2020.04.005
• Public URL: https://durham-repository.worktribe.com/output/1265560