Bounds on the metric and partition dimensions of a graph

Given a graph G, we say S µ V (G) is resolving if for each pair of distinct u;v 2 V (G) there is a vertex x in S where d(u;x) 6 d(v;x). The metric dimension of G is the minimum cardinality of all resolving sets. For w 2 V (G), the distance from w to S, denoted d(w;S), is the minimum distance between w and the vertices of S. Given P = fP1;P2;:::;Pkg an ordered partition of V (G) we say P is resolving if for each pair of distinct u;v 2 V (G) there is a part Pi where d(u;Pi) 6 d(v;Pi). The partition dimension is the minimum order of all resolving partitions. In this paper we consider relationships between metric dimension, partition dimension, diameter, and other graph parameters. We construct \universal examples" of graphs with given partition dimension, and we use these to provide bounds on various graph parameters based on metric and partition dimensions. We form † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † † ¢¢¢ ¢¢¢ ¢¢¢ † † † † † ¢¢¢ | }