Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In computer science, the Method of Four Russians is a technique for speeding up algorithms involving Boolean matrices, or more generally algorithms involving matrices in which each cell may take on only a bounded number of possible values. The main idea of the method is to partition the matrix into small square blocks of size t ? t for some parameter t, and to use a lookup table to perform the algorithm quickly within each block. The index into the lookup table encodes the values of the matrix cells on the block boundary prior to some operation of the algorithm, and the result of the lookup table encodes the values of the boundary cells after the operation.

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