## On the Complexity of Reconfiguration of Clique, Cluster Vertex Deletion, and Dominating Set

dc.contributor.author | Tebbal, Youcef | |

dc.date.accessioned | 2015-07-15 20:09:20 (GMT) | |

dc.date.available | 2015-07-15 20:09:20 (GMT) | |

dc.date.issued | 2015-07-15 | |

dc.date.submitted | 2015 | |

dc.identifier.uri | http://hdl.handle.net/10012/9470 | |

dc.description.abstract | A graph problem P is a vertex-subset problem if feasible solutions for P consist of subsets of the vertices of a graph G. The st-connectivity problem for a vertex-subset problem P takes as input two feasible solutions S_s and S_t, and determines if there is a sequence of recon figuration steps that can be applied to transform S_s into S_t, such that each step results in a feasible solution of P of size bounded by k and each step is a vertex addition or deletion. For most NP-complete problems, this problem has been shown to be PSPACE-complete, while for some problems in P, this problem could be either in P or PSPACE-complete. However, knowing the complexity of a decision problem does not directly imply the complexity of its st-connectivity problem. Therefore, it is natural to ask whether we can fi nd a connection between the complexity of a decision problem and its st-connectivity problem when restricted to graph classes. This question motivated us to study the st-connectivity problems Clique Reconfiguration and Dominating Set Reconfiguration, whose decision problems' complexity for restricted graph classes is extensively studied, to get a better understanding of the boundary between polynomial-time solvable and intractable instances of these reconfi guration problems. Furthermore, we study the Cluster Vertex Deletion Reconfiguration problem, a problem whose decision problem is related to the Clique problem, to fi nd whether there is a connection between the complexity of this problem and the Clique Reconfiguration problem. Following are the main contributions of this thesis. First, we show that the Clique Re- configuration problem is linear-time solvable for paths, trees, bipartite graphs, chordal graphs, and cographs. Then, we prove that the Cluster Vertex Deletion Reconfiguration problem is linear-time solvable for paths and trees, and that it is NP-hard on bipartite graphs, and PSPACE-complete in general. Finally, we determine that the Dominating Set Reconfiguration problem is linear-time solvable for paths, cographs, trees, and interval graphs. Furthermore, we show that the problem is PSPACE-complete for general graphs, bipartite graphs, and split graphs. | en |

dc.language.iso | en | en |

dc.publisher | University of Waterloo | en |

dc.subject | reconfiguration | en |

dc.title | On the Complexity of Reconfiguration of Clique, Cluster Vertex Deletion, and Dominating Set | en |

dc.type | Master Thesis | en |

dc.pending | false | |

dc.subject.program | Computer Science | en |

uws-etd.degree.department | School of Computer Science | en |

uws-etd.degree | Master of Mathematics | en |

uws.typeOfResource | Text | en |

uws.peerReviewStatus | Unreviewed | en |

uws.scholarLevel | Graduate | en |