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We consider a special case of the scheduling problem on unrelated machines, namely the restricted assignment problem with two different processing times. We show that the configuration LP has an integrality gap of at most $$\frac{5}{3} \approx 1.667$$ 53≈1.667 for this problem. This allows us to estimate the optimal makespan within a factor of $$\frac{5}{3}$$ 53 , improving upon the previously best...
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