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On the total vertex irregularity strength of trees. (English) Zbl 1208.05014
Summary: A vertex irregular total \(k\)-labelling \(\lambda :V(G) \cup E(G) \to \{1,2,\dots ,k\}\) of a graph \(G\) is a labelling of vertices and edges of \(G\) done in such a way that for any different vertices \(x\) and \(y\), their weights \(wt(x)\) and \(wt(y)\) are distinct. The weight \(wt(x)\) of a vertex \(x\) is the sum of the label of \(x\) and the labels of all edges incident with \(x\). The minimum \(k\) for which a graph \(G\) has a vertex irregular total \(k\)-labelling is called the total vertex irregularity strength of \(G\), denoted by tvs\((G)\). In this paper, we determine the total vertex irregularity strength of trees.

05C05 Trees
05C78 Graph labelling (graceful graphs, bandwidth, etc.)
Full Text: DOI
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