Abstract
Let \(G=(V,E)\) be a simple graph. A vertex \(v\in V\) ve-dominates every edge uv incident to v, as well as every edge adjacent to these incident edges. A set \(D\subseteq V\) is a double vertex-edge dominating set if every edge of E is ve-dominated by at least two vertices of D. The double vertex-edge dominating problem is to find a minimum double vertex-edge dominating set of G. In this paper, we show that minimum double vertex-edge dominating problem is NP-complete for chordal graphs. A linear time algorithm to find the minimum double vertex-edge dominating set for proper interval graphs is proposed. We also show that the minimum double vertex-edge domination problem cannot be approximated within \((1-\varepsilon )\ln |V|\) for any \(\varepsilon >0\) unless NP\(\subseteq \) DTIME\((|V|^{O(\log \log |V|)})\). Finally, we prove that the minimum double vertex-edge domination problem is APX-complete for graphs with maximum degree 5.
Supported by National Board for Higher Mathematics, Mumbai, India. (Ref No.: NBHM/R.P.1/2015/Fresh/168).
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Venkatakrishnan, Y.B., Naresh Kumar, H. (2019). On the Algorithmic Complexity of Double Vertex-Edge Domination in Graphs. In: Das, G., Mandal, P., Mukhopadhyaya, K., Nakano, Si. (eds) WALCOM: Algorithms and Computation. WALCOM 2019. Lecture Notes in Computer Science(), vol 11355. Springer, Cham. https://doi.org/10.1007/978-3-030-10564-8_15
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