engleski

Bounds on metric dimensions of graphs with edge disjoint cycles

In a graph cardinality of the smallest ordered set of vertices that distinguishes every element of is the (vertex) metric dimension of . Similarly, the cardinality of such a set is the edge metric dimension of if it distinguishes . In this paper these invariants are considered first for unicyclic graphs, and it is shown that the vertex and edge metric dimensions obtain values from two particular consecutive integers, which can be determined from the structure of the graph. In particular, as a consequence, we obtain that these two invariants can differ by at most one for a same unicyclic graph. Next we extend the results to graphs with edge disjoint cycles (i.e. cactus graphs) showing that the two invariants can differ by at most where is the number of cycles in such a graph. We conclude the paper with a conjecture that generalizes the previously mentioned consequences to graphs with prescribed cyclomatic number by claiming that the difference of the invariant is still bounded by .

metric dimensions

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