A direct sum theorem in communication complexity via message compression

  title={A direct sum theorem in communication complexity via message compression},
  author={Rahul Jain and Jaikumar Radhakrishnan and Pranab Sen},
We prove lower bounds for the direct sum problem for two-party bounded error randomised multipleround communication protocols. Our proofs use the notion of information cost of a protocol, as defined by Chakrabarti et al. [CSWY01] and refined further by Bar-Yossef et al. [BJKS02]. Our main technical result is a ‘compression’ theorem saying that, for any probability distribution over the inputs, a -round private coin bounded error protocol for a function with information cost can be converted… CONTINUE READING
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