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09/08/08 9:38pm

I was trying to get mathematica to simplify sums such as the following:

Sum[KroneckerDelta[i, k], {i, 1, n}, {k, 1, n}]

which should automatically resolve to n, or to simplify

Sum[KroneckerDelta[i, k]x[i], {i, 1, n}, {k, 1, n}]

but was unable to do so. Is mathematica capable of doing this, and if so, what is the appropriate command?

Also, I was wondering if there was a way to get the product of sums to be expanded as, for example, an appropriate double-sum.

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