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Integrality Gap of the Vertex Cover Linear Programming Relaxation (1907.11209v1)
Published 25 Jul 2019 in cs.DS and cs.DM
Abstract: We give a characterization result for the integrality gap of the natural linear programming relaxation for the vertex cover problem. We show that integrality gap of the standard linear programming relaxation for any graph G equals $\left(2-\frac{2}{\chif(G)}\right)$ where $\chif(G)$ denotes the fractional chromatic number of G.
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