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Hardness of approximation for Knapsack problems Buhrman, H.M.; Loff, B.F.L.; Torenvliet, L. Abstract We show various hardness results for knapsack and related problems; in particular we will show that unless the Exponential-Time Hypothesis is false, subsetsum cannot be approximated any better than with an FPTAS. We also provide new unconditional lower bounds for approximating knapsack in Ketan Mulmuley's parallel PRAM model. Furthermore, we give a simple new algorithm for approximating knapsackdoi:10.1007/s00224-014-9550-z fatcat:qwgirc5sifa6flvmb7imrkcmpi