SCHWEITZER 1997 Problem 4
An elementary change in a 0-1 matrix is a change in an element and with it all its horizontal, vertical, and diagonal neighbors (0 to 1 or 1 to 0). Can any 1791 x 1791 0-1 matrix be transformed into a zero matrix with elementary changes?
Dataset text AI-MO AoPS. Quoted with source.
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