Most graph labeling methods trace their origin to one introduced by Alex Rosa, through the paper "On certain valuations of the vertices of a graph", which was presented in the International Symposium, held in Rome, July 1966,Gordon and Breach, N.Y. and Dunod Paris (1967) 349-355, or one given by R.L.Graham and N.J.A. Sloane, through the paper "On additive bases and harmonious graphs", SIAM J. Alg. Discrete Meth., 1 (1980) 382-404. Labeled graphs became a very useful tool for treating many problems in different branches of science, e.g. Electrical Networks, Coding Theory, Astronomy, X-Ray Crystallographic analysis. S. M. Hegde and S. Shetty defined what is called "Permutation and Combination Labelings". This book consists of some papers which give some rich additions to these two types of labelings.

L'autore:

Born in 1944, Cairo, Egypt. He obtained his B.Sc. in Electrical Communications in 1966 B.Sc., in Pure Mathematics and Statistics in 1969, M.Sc. in Pure Mathematics (Numerical Analysis) in 1972 from Ain Shams University, Cairo, Dr.rer.nat. in Mathematics (Algebra) in 1979 from University of Munich. Since 1993 he is Professor of Pure Mathematics.

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