Mathematicians love a good puzzle. Even something as abstract as multiplying matrices (two-dimensional tables of numbers) can feel like a game when you try to find the most efficient way to do it.
The Canadian Journal of Statistics / La Revue Canadienne de Statistique, Vol. 11, No. 3 (Sep., 1983), pp. 221-231 (11 pages) The commutation matrix Pmn changes the order of multiplication of a ...
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