ISSN 1234-3099 (print version)

ISSN 2083-5892 (electronic version)

Discussiones Mathematicae Graph Theory

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Discussiones Mathematicae Graph Theory


Discussiones Mathematicae Graph Theory 24(2) (2004) 303-318
DOI: 10.7151/dmgt.1233


Alewyn P. Burger and Christina M. Mynhardt

Department of Mathematics and Statistics
University of Victoria
P.O. Box 3045, Victoria, BC Canada V8W 3P4


William D. Weakley

Department of Mathematical Sciences
Indiana University - Purdue University
Fort Wayne, IN 46805, USA



For a permutation π of the vertex set of a graph G, the graph πG is obtained from two disjoint copies G1 and G2 of G by joining each v in G1 to π(v) in G2. Hence if π = 1, then πG = K2×G, the prism of G. Clearly, γ(G) ≤ γ(πG) ≤ 2 γ(G). We study graphs for which γ (K2×G) = 2γ(G), those for which γ(πG) = 2γ(G) for at least one permutation π of V(G) and those for which γ (πG) = 2γ(G) for each permutation π of V(G).

Keywords: domination, graph products, prisms of graphs.

2000 Mathematics Subject Classification: 05C69.


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Received 1 October 2002
Revised 29 April 2003