Hardness of Approximating Flow and Job Shop Scheduling Problems

  title={Hardness of Approximating Flow and Job Shop Scheduling Problems},
  author={Monaldo Mastrolilli and Ola Svensson},
  journal={J. ACM},
We consider several variants of the job shop problem that is a fundamental and classical problem in scheduling. The currently best approximation algorithms have worse than logarithmic performance guarantee, but the only previously known inapproximability result says that it is NP-hard to approximate job shops within a factor less than 5/4. Closing this big approximability gap is a well-known and long-standing open problem. This article closes many gaps in our understanding of the hardness of… CONTINUE READING