A note on the independent domination number versus the domination number in bipartite graphs |
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| Authors: | Shaohui Wang Bing Wei |
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| Institution: | 1.Department of Mathematics,The University of Mississippi,Oxford,USA;2.Department of Mathematics and Computer Science,Adelphi University,Garden City,USA |
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| Abstract: | Let γ(G) and i(G) be the domination number and the independent domination number of G, respectively. Rad and Volkmann posted a conjecture that i(G)/γ(G) ≤ Δ(G)/2 for any graph G, where Δ(G) is its maximum degree (see N. J. Rad, L. Volkmann (2013)). In this work, we verify the conjecture for bipartite graphs. Several graph classes attaining the extremal bound and graphs containing odd cycles with the ratio larger than Δ(G)/2 are provided as well. |
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