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The paper deals with the determination of an optimal schedule for the so‐calledmixed‐shopproblem when the makespan has to be minimized. In such a problem, some jobs havefixed machine orders (as in the job‐shop), while the operations of the otherjobs may be processed in arbitrary order (as in the open‐shop). We provebinary NP‐hardness of the preemptive problem with three machines and three jobs(two...
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