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• W2949454067 abstract "The direct product problem is a fundamental question in complexity theory which seeks to understand how the difficulty of computing a function on each of k independent inputs scales with k. We prove the following direct product theorem (DPT) for query complexity: if every T-query algorithm has success probability at most 1 - eps in computing the Boolean function f on input distribution Mu, then for alpha 0, the worst-case success probability of any (alpha R_2(f)k)-query randomized algorithm for f^k falls exponentially with k. The best previous statement of this type, due to Klauck, Spalek, and de Wolf, required a query bound of O(bs(f)k). The proof involves defining and analyzing a collection of martingales associated with an algorithm attempting to solve f^k. Our method is quite general and yields a new XOR lemma and threshold DPT for the query model, as well as DPTs for the query complexity of learning tasks, search problems, and tasks involving interaction with dyamic entities. We also give a version of our DPT in which decision tree size is the resource of interest." @default.
• W2949454067 created "2019-06-27" @default.
• W2949454067 creator A5037697309 @default.
• W2949454067 date "2010-05-04" @default.
• W2949454067 modified "2023-09-27" @default.
• W2949454067 title "Improved Direct Product Theorems for Randomized Query Complexity" @default.
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• W2949454067 hasPublicationYear "2010" @default.
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