Istituto di Scienza e Tecnologie dell'Informazione     
Montanari U. On the optimal approximation of discrete functions with low-dimensional tables. Internal note IEI-B70-25, 1970.
The practical problem of storing large high-dimensional arrays is often critical in numerical methods. For instance, the main limitation of dynamic programming optimization techniques (1) is the dimension of intermediate tables. If an approximate representation can be tolerated, many methods can be devised. For instance truncated expansions in terms of orthogonal functions can be a solution (2).

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