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Abstract:
We prove that almost all Boolean function has a high $k$--party communication complexity. The 2--party case was settled by {\it Papadimitriou} and {\it Sipser}.
Proving the $k$--party case needs a deeper investigation of the underlying structure
of the $k$--cylinder--intersections; (the 2--cylinder--intersections are the rectangles).
\noindent First we examine the basic properties of $k$--cylinder--intersections, then an upper estimation is given for their number, which facilitates to prove the lower--bound theorem for the $k$--party communication complexity of randomly chosen Boolean functions. In the last section we extend our results to the $\varepsilon$--distributional communication complexity of random functions.
