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period problem production demand algorithm period t heuristic solution model setup instance lot-sizing performance inventory production plan property problem instance production plans function price section ratio number research example order result remanufacturing horizon value return interval van den heuvel management proof lot-sizing problem els problem table setup cost lemma 0.00 point performance ratio market elsr problem demand sequence class segment wagelman figure manufacturing case ratio theorem subplan paper envelope decision production period piece case performance period i sequence polynomial time production costs line segments method procedure complexity iteration 0.01 problem instances regeneration parameter pricing lot-sizing model prof.dr polynomial capacity profit plans y j
