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# The Parameterized Complexity of the Minimum Shared Edges Problem

**Till Fluschnik (TU Berlin)**

We study the NP-complete Minimum Shared Edges (MSE) problem. Given an undirected graph, a source and a sink vertex, and two integers p and k, the question is whether there are p paths in the graph connecting the source with the sink and sharing at most k edges. Herein, an edge is shared if it appears in at least two paths. We show that MSE is W[1]-hard when parameterized by the treewidth of the input graph and the number k of shared edges combined. We show that MSE is fixed-parameter tractable with respect to p, but does not admit a polynomial-size kernel (unless NP ⊆ coNP/poly). In the proof of the fixed-parameter tractability of MSE parameterized by p, we employ the treewidth reduction technique due to Marx, O’Sullivan, and Razgon [ACM TALG 2013].

The talk is based on a joint work with Stefan Kratsch, Rolf Niedermeier and Manuel Sorge.

Date | Speaker | Location | Language |
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03.12.2015 16:15 | Till Fluschnik | TEL 512 | English |