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Exponential Separation of Information and Communication

机译:信息与通信的指数分离

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We show an exponential gap between communication complexity and information complexity, by giving an explicit example for a communication task (relation), with information complexity ≤ O(k), and distributional communication complexity ≥ 2k. This shows that a communication protocol cannot always be compressed to its internal information. By a result of Braverman [1], our gap is the largest possible. By a result of Braverman and Rao [2], our example shows a gap between communication complexity and amortized communication complexity, implying that a tight direct sum result for distributional communication complexity cannot hold.
机译:通过给出通信任务(关系)的显式示例,信息复杂度≤O(k),分布通信复杂度≥2k,我们展示了通信复杂度和信息复杂度之间的指数差距。这表明通信协议不能始终被压缩为其内部信息。通过Braverman [1]的结果,我们的差距是最大的。通过Braverman和Rao [2]的结果,我们的示例显示了通信复杂度与摊销的通信复杂度之间的差距,这意味着无法满足分布式通信复杂度的紧迫直接和结果。

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