Talk:Sparse grid

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This page badly needs examples: First, illustrations of sparse grids in 2D (showing different levels of descretization), and second, steps in constructing one of the sparse grids. Without the latter, the formula is too hard to interpret. I guess is a set of 2^l points, each of dimension d, and − represents set difference. However, the operation needs explanation.

Could the statement "A 1 − d integration on level i is computed by the evaluation of O(2ⁱ) points" be restated as "A one-dimensional integration..."? If so, it should be. Note that d is a variable already being used, so 1 − d is a (nonpositive) number. However, a phrase like "-2 integration" does not make sense. Jrvz 11:48, 16 August 2007 (UTC)