Minimum weighted clique cover on strip-composed perfect graphs

  • Authors:
  • Flavia Bonomo;Gianpaolo Oriolo;Claudia Snels

  • Affiliations:
  • IMAS-CONICET and Departamento de Computación, FCEN, Universidad de Buenos Aires, Argentina;Dipartimento di Informatica, Sistemi e Produzione, Università di Roma Tor Vergata, Italia;Dipartimento di Informatica, Sistemi e Produzione, Università di Roma Tor Vergata, Italia

  • Venue:
  • WG'12 Proceedings of the 38th international conference on Graph-Theoretic Concepts in Computer Science
  • Year:
  • 2012

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Abstract

The only available combinatorial algorithm for the minimum weighted clique cover (mwcc) in claw-free perfect graphs is due to Hsu and Nemhauser [10] and dates back to 1984. More recently, Chudnovsky and Seymour [3] introduced a composition operation, strip-composition, in order to define their structural results for claw-free graphs; however, this composition operation is general and applies to non-claw-free graphs as well. In this paper, we show that a mwcc of a perfect strip-composed graph, with the basic graphs belonging to a class ${\cal G}$, can be found in polynomial time, provided that the mwcc problem can be solved on ${\cal G}$ in polynomial time. We also design a new, more efficient, combinatorial algorithm for the mwcc problem on strip-composed claw-free perfect graphs.