Dominating sets in k-majority tournaments

A k-majority tournament T on a finite vertex set V is defined by a set of 2k - 1 linear orderings of V, with u v if and only if u lies above v in at least k of the orders. Motivated in part by the phenomenon of "non-transitive dice", we let F(k) be the maximum over all k-majority tournaments T of the size of a minimum dominating set of T. We show that F(k) exists for all k > 0, that F(2) = 3 and that in general C1k/ log k F(k) C2k log k for suitable positive constants C1 and C2.

• Type: Journal
• Year: 2006
• Where: JCT
• Authors: Noga Alon, Graham Brightwell, Hal A. Kierstead, Alexandr V. Kostochka, Peter Winkler
• Keywords: Finite Vertex, JCT 2006, K-majority Tournaments, Linear Orderings