On metric dimension of cube of trees

Document Type : Original paper

Authors

1 Department of Mathematics, C.V. Raman Global University, Bhubaneswar 752054, India

2 Department of Mathematics, Balurghat College, Balurghat 733101, India

3 Department of Mathematics, Presidency University, Kolkata 700073, India

Abstract

Let G=(V,E) be a connected graph and dG(u,v) be the shortest distance between the vertices u and v in G. A set S={s1,s2,,sn}V(G) is said to be a {\em resolving set} if for all distinct vertices u,v of G, there exists an element sS such that dG(s,u)dG(s,v). The minimum cardinality of a resolving set for a graph G is called the metric dimension of G, and it is denoted by β(G). A resolving set having β(G) number of vertices is named as metric basis of G. The metric dimension problem is to find a metric basis in a graph G, and it has several real-life applications in network theory, telecommunication, image processing, pattern recognition, and many other fields. In this article, we consider cube of trees T3=(V,E), where any two vertices u,v are adjacent if and only if the distance between them is less than or equal to three in T. We establish the necessary and sufficient conditions for a vertex subset of V to become a resolving set for T3. This helps to determine the tight bounds (upper and lower) on the metric dimension of T3. Then, for certain well-known cube of trees, such as caterpillars, lobsters, spiders, and d-regular trees, we establish the boundaries for the metric dimension. Also, for every positive integer, we provide a construction showing the existence of a cube of a tree satisfying its metric dimension as the given integer. Further, we characterize some restricted families of cube of trees satisfying β(T3)=β(T).

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