Discussiones Mathematicae Graph Theory 29(3) (2009) 615-627
doi: 10.7151/dmgt.1468

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Włodzimierz Ulatowski

Faculty of Physics and Mathematics
Gdańsk University of Technology
Narutowicza 11/12, 80-952 Gdańsk, Poland
e-mail: twoulat@mif.pg.gda.pl


In this paper we show upper bounds for the sum and the product of the lower domination parameters and the chromatic index of a graph. We also present some families of graphs for which these upper bounds are achieved. Next, we give a lower bound for the sum of the upper domination parameters and the chromatic index. This lower bound is a function of the number of vertices of a graph and a new graph parameter which is defined here. In this case we also characterize graphs for which a respective equality holds.

Keywords: domination, domination parameters, chromatic index.

2000 Mathematics Subject Classification: 05C69, 05C15.


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Received 19 September 2008
Revised 23 October 2008
Accepted 13 November 2008