Quasi-Poly-Time Poly-Time Observations needed for Quasi-poly-time Poly-time 1.The depth of the tree T is O(log n), say a log n for some constant a > 0, 2.The number of classes can be reduced from O(log n) to O(log n/log log n) by defining class 0 to be the set of trees T with conductance(T) < (log n) OPT and class k to be set of trees T with (log n) k OPT < Conductance(T) < (log n) k+1 OPT Lose another log n factor here. 3.Carefully restrict the vectors considered in the dynamic program. Main Conclusion: Poly-log approximation for Min-Max non-overlap is much harder than logarithmic approximation for overlap.