Communication Complexity and Parallel Computing

The communication complexity of two-party protocols is an only 15 years old complexity measure, but it is already considered to be one of the fundamen­ tal complexity measures of recent complexity theory. Similarly to Kolmogorov complexity in the theory of sequential computations, communication complex­ ity is used as a method for the study of the complexity of concrete computing problems in parallel information processing. Especially, it is applied to prove lower bounds that say what computer r