Discussiones
Mathematicae Graph Theory 21(1) (2001) 63-75
DOI: https://doi.org/10.7151/dmgt.1133
STRONGLY MULTIPLICATIVE GRAPHS
L.W. Beineke Indiana University-Purdue University |
S.M. Hegde Karnataka Regional Engineering College |
Abstract
A graph with p vertices is said to be strongly multiplicative if its vertices can be labelled 1,2,...,p so that the values on the edges, obtained as the product of the labels of their end vertices, are all distinct. In this paper, we study structural properties of strongly multiplicative graphs. We show that all graphs in some classes, including all trees, are strongly multiplicative, and consider the question of the maximum number of edges in a strongly multiplicative graph of a given order.
Keywords: graph labelling, multiplicative labelling.
2000 Mathematics Subject Classification: 05C78.
References
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Received 9 August 2000
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