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• W1785707220 abstract "We study the following general disjoint paths problem: given a supply graph G, a set T ⊆ V(G) of terminals, a demand graph H on the vertices T, and an integer k, the task is to find a set of k pairwise vertex-disjoint valid paths, where we say that a path of the supply graph G is valid if its endpoints are in T and adjacent in the demand graph H. For a class H of graphs, we denote by Maximum Disjoint H-Paths the restriction of this problem when the demand graph H is assumed to be a member of H. We study the fixed-parameter tractability of this family of problems, parameterized by k. Our main result is a complete characterization of the fixed-parameter tractable cases of Maximum Disjoint H-Paths for every hereditary class H of graphs: it turns out that complexity depends on the existence of large induced matchings and large induced skew bicliques in the demand graph H (a skew biclique is a bipartite graph on vertices a1, . . ., an, b1, . . ., bn with ai and bj being adjacent if and only if i ≤ j). Specifically, we prove the following classification for every hereditary class H.• If H does not contain every matching and does not contain every skew biclique, then Maximum Disjoint H-Paths is FPT.• If H does not contain every matching, but contains every skew biclique, then Maximum Disjoint H-Paths is W[1]-hard, admits an FPT approximation, and the valid paths satisfy an analog of the Erdos-Posa property.• If H contains every matching, then Maximum Disjoint H-Paths is W[1]-hard and the valid paths do not satisfy the analog of the Erdos-Posa property." @default.
• W1785707220 created "2016-06-24" @default.
• W1785707220 creator A5012849997 @default.
• W1785707220 creator A5035367746 @default.
• W1785707220 date "2015-01-04" @default.
• W1785707220 modified "2023-09-23" @default.
• W1785707220 title "An exact characterization of tractable demand patterns for maximum disjoint path problems" @default.
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• W1785707220 doi "https://doi.org/10.5555/2722129.2722173" @default.
• W1785707220 hasPublicationYear "2015" @default.
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