Abstract
In this paper the minmax (regret) versions of some basic polynomially solvable deterministic network problems are discussed. It is shown that if the number of scenarios is unbounded, then the problems under consideration are not approximable within log 1 − ϵ K for any ϵ > 0 unless NP ⊆ DTIME ( n poly log n ) , where K is the number of scenarios.
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