### A note on the metric dimension of subdivided thorn graphs

#### Abstract

For some ordered subset *W* = {*w*_{1}, *w*_{2}, ⋯, *w*_{t}} of vertices in connected graph *G*, and for some vertex *v* in *G*, the metric representation of *v* with respect to *W* is defined as the *t*-vector *r*(*v*∣*W*) = {*d*(*v*, *w*_{1}), *d*(*v*, *w*_{2}), ⋯, *d*(*v*, *w*_{t})}. The set *W* is the resolving set of *G* if for every two vertices *u*, *v* in *G*, *r*(*u*∣*W*) ≠ *r*(*v*∣*W*). The metric dimension of *G*, denoted by dim(*G*), is defined as the minimum cardinality of *W*. Let *G* be a connected graph on *n* vertices. The thorn graph of *G*, denoted by *T**h*(*G*, *l*_{1}, *l*_{2}, ⋯, *l*_{n}), is constructed from *G* by adding *l*_{i} leaves to vertex *v*_{i} of *G*, for *l*_{i} ≥ 1 and 1 ≤ *i* ≤ *n*. The subdivided-thorn graph, denoted by *T**D*(*G*, *l*_{1}(*y*_{1}), *l*_{2}(*y*_{2}), ⋯, *l*_{n}(*y*_{n})), is constructed by subdividing every *l*_{i} leaves of the thorn graph of *G* into a path on *y*_{i} vertices. In this paper the metric dimension of thorn of complete graph, dim(*T**h*(*K*_{n}, *l*_{1}, *l*_{2}, ⋯, *l*_{n})), *l*_{i} ≥ 1 are determined, partially answering the problem proposed by Iswadi et al . This paper also gives some conjectures for the lower bound of dim(*T**h*(*G*, *l*_{1}, *l*_{2}, ⋯, *l*_{n})), for arbitrary connected graph *G*. Next, the metric dimension of subdivided-thorn of complete graph, dim(*T**D*(*K*_{n}, *l*_{1}(*y*_{1}), *l*_{2}(*y*_{2}), ⋯, *l*_{n}(*y*_{n})) are determined and some conjectures for the lower bound of dim(*T**h*(*G*, *l*_{1}(*y*_{1}), *l*_{2}(*y*_{2}), ⋯, *l*_{n}(*y*_{n})) for arbitrary connected graph *G* are given.

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DOI: http://dx.doi.org/10.19184/ijc.2019.3.1.4

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