UNICYCLIC GRAPHS WITH NON-ISOLATED RESOLVING NUMBER 2.

Let G be a connected graph and W = {w1;w2; . . . ;}kg be an ordered subset of vertices of G. For any vertex v of G, the ordered k-vector r(v|W) = (d(v;w1); d(v;w2); . . .; d(v;wk)) is called the metric representation of v with respect to W, where d(x; y) is the distance between the vertices x and y. A set W is called a resolving set for G if distinct vertices of G have distinct metric representations with respect to W. The minimum cardinality of a resolving set for G is its metric dimension denoted by dim(G). A resolving set W is called a non-isolated resolving set for G if the induced subgraph hWi of G has no isolated vertices. The minimum cardinality of a non-isolated resolving set for G is called the non-isolated resolving number of G and denoted by nr(G). The aim of this paper is to find properties of unicyclic graphs that have non-isolated resolving number 2 and then to characterize all these graphs. [ABSTRACT FROM AUTHOR]