Abstract

We construct a sequence of monotone Boolean functions hn:{0, 1}n→{0, 1}n, such that the monotone complexity of hn is of order n2/log n. This result includes the largest known lower bound of this kind. Previously there were an Ω(n3/2) bound for the Boolean matrix product, an Ω(n5/3) bound for Boolean sums and an Ω(n2/log2n) bound of the author for the same functions hn. This new lower bound is proved by new methods which probably will turn out to be useful also for other problems.

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