Abstract
The strong isometric dimension and the adjacent isometric dimension of graphs are compared. The concepts are equivalent for graphs of diameter 2 in which case the problem of determining these dimensions can be reduced to a covering problem with complete bipartite graphs. Using this approach several exact strong and adjacent dimensions are computed (for instance of the Petersen graph) and a positive answer is given to the Problem 4.1 of Fitzpatrick and Nowakowski [The strong isometric dimension of finite reflexive graphs, Discuss. Math. Graph Theory 20 (2000) 23–38] whether there is a graph G with the strong isometric dimension bigger that ⌈ | V ( G ) | / 2 ⌉ .
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