Skip to Main content Skip to Navigation
Other publications

Coalition structures induced by the strength of a graph

Abstract : We study cooperative games associated with a communication structure which takes into account a level of communication between players. Let us consider an undirected communication graph : each node represents a player and there is an edge between two nodes if the corresponding players can communicate directly. Moreover we suppose that a weight is associated with each edge. We compute the so-called strength of this graph and use the corresponding partition to determine a particular coalition structure. The strength of a graph is a measure introduced in graph theory to evaluate the resistance of networks under attacks. It corresponds to the minimum on all subsets of edges of the ratio between the sum of the weights of the edges and the number of connected components created when the set of edges is suppressed from the graph. The set of edges corresponding to the minimum ratio induces a partition of the graph. We can iterate the calculation of the strength on the subgraphs of the partition to obtain refined partitions which we use to define a hierarchy of coalition structures. For a given game on the graph, we build new games induced by these coalition structures and study the inheritance of convexity properties, and the Shapley value associated with them.
Complete list of metadatas

Cited literature [14 references]  Display  Hide  Download
Contributor : Lucie Label <>
Submitted on : Wednesday, November 9, 2011 - 5:23:53 PM
Last modification on : Tuesday, December 1, 2020 - 3:43:32 AM
Long-term archiving on: : Friday, February 10, 2012 - 2:37:04 AM


Files produced by the author(s)


  • HAL Id : halshs-00639685, version 1


Michel Grabisch, Alexandre Skoda. Coalition structures induced by the strength of a graph. 2011. ⟨halshs-00639685⟩



Record views


Files downloads