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- W2143305437 abstract "The k-domination number of a graph is the minimum size of a set D such that every vertex of G is at distance at most k from D. We give a linear-time constant-factor algorithm for approximation of the k-domination number in classes of graphs with bounded expansion, which include e.g. proper minor-closed graph classes, proper classes closed on topological minors and classes of graphs that can be drawn on a fixed surface with bounded number of crossings on each edge. The algorithm is based on the following approximate min–max characterization. A subset A of vertices of a graph G is d-independent if the distance between each two vertices in A is greater than d. Note that the size of the largest 2k-independent set is a lower bound for the k-domination number. We show that every graph from a fixed class with bounded expansion contains a 2k-independent set A and a k-dominating set D such that |D|=O(|A|), and these sets can be found in linear time. For a fixed value of k, the assumptions on the class can be formulated more precisely in terms of generalized coloring numbers. In particular, for the domination number (k=1), the results hold for all graph classes with arrangeability bounded by a constant." @default.
- W2143305437 created "2016-06-24" @default.
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- W2143305437 date "2013-07-01" @default.
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- W2143305437 title "Constant-factor approximation of the domination number in sparse graphs" @default.
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- W2143305437 doi "https://doi.org/10.1016/j.ejc.2012.12.004" @default.
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