The Rectangle Covering Number of Random Boolean Matrices

  • Mozhgan Pourmoradnasseri
  • Dirk Oliver Theis
Keywords: Random graphs, Graph coloring, Communication complexity


The rectangle covering number of an $n$-by-$n$ Boolean matrix $M$ is the smallest number of 1-rectangles which are needed to cover all the 1-entries of $M$. Its binary logarithm is the Nondeterministic Communication Complexity, and it equals the chromatic number of a graph $G(M)$ obtained from $M$ by a construction of Lovasz and Saks.

We determine the rectangle covering number and related parameters (clique size, independence ratio, fractional chromatic number of $G(M)$) of random Boolean matrices, where each entry is 1 with probability $p = p(n)$, and the entries are independent.

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