Minimum survivable graphs with bounded distance increase

• Main Authors: Selma Djelloul, Mekkia Kouider
• Format: Article
• Language: English
• Published: Discrete Mathematics & Theoretical Computer Science 2003-06-01
• Series: Discrete Mathematics & Theoretical Computer Science
• Online Access: http://www.dmtcs.org/dmtcs-ojs/index.php/dmtcs/article/view/182

We study in graphs properties related to fault-tolerance in case a node fails. A graph G is k-self-repairing, where k is a non-negative integer, if after the removal of any vertex no distance in the surviving graph increases by more than k. In the design of interconnection networks such graphs guarantee good fault-tolerance properties. We give upper and lower bounds on the minimum number of edges of a k-self-repairing graph for prescribed k and n, where n is the order of the graph. We prove that the problem of finding, in a k-self-repairing graph, a spanning k-self-repairing subgraph of minimum size is NP-Hard.