Titlebook: Approximation Algorithms for Combinatorial Optimization; International Worksh Klaus Jansen,José Rolim Conference proceedings 1998 Springer-

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https://doi.org/10.1007/978-3-8350-9627-1e distance between any two vertices in . is larger than that distance in . by no more than a factor of .. This paper concerns the hardness of finding spanners with the number of edges close to the optimum. It is proved that for every fixed . approximating the spanner problem is at least as hard as a

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