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Miller, Mirka; Ryan, Joe; Ryjáček, Zdeněk
Electronic notes in discrete mathematics, July 2017, 2017-07-00, Letnik: 60Journal Article
A sum graph G is a graph with a mapping of the vertex set of G onto a set of positive integers S in such a way that two vertices of G are adjacent if and only if the sum of their labels is an element of S. In an exclusive sum graph the integers of S that are the sum of two other integers of S form a set of integers that label a collection of isolated vertices associated with the graph G. A graph bears a k-exclusive sum labelling (abbreviated k-ESL), if the set of isolated vertices is of cardinality k. In this paper, observing that the property of having a k-ESL is hereditary, we provide a characterisation of graphs that have a k-exclusive sum labelling, for any k≥1, in terms of describing a universal graph for the property.
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