Total Domination of Grid Graphs

Simon Crevals1, Patric R. J. Ostergard1
1Department of Communications and Networking Aalto University School of Electrical Engineering P.O. Box 13000, 00076 Aalto, Finland

Abstract

The size of a minimum total dominating set in the \(m \times n\) grid graph is denoted by \(\gamma_t(P_m \square P_n)\). Here a dynamic programming algorithm that computes \(\gamma_t(P_m \square P_n)\) for any \(m\) and \(n\) is presented, and it is shown how properties of the algorithm can be used to derive formulae for a fixed, small value of \(m\). Using this method, formulae for \(\gamma_t(P_m \square P_n)\) for \(m \leq 28\) are obtained. Formulae for larger \(m\) are further conjectured, and a new general upper bound on \(\gamma_t(P_m \square P_n)\) is proved.