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Oct 8, 2015 at 17:10 comment added AltLHC If I am not mistaken the original delta function has to be $\delta^{(n)}(f(x^{i}))$ for the initial equality to be valid? Otherwise only one variable would be constrained on the left side whereas all are constrained on the right.
Feb 28, 2014 at 12:39 comment added JeffDror +1 Nice proof! Sorry, my answer is essentially identical to yours... I didn't see you already posted.
Feb 28, 2014 at 12:34 history answered jpm CC BY-SA 3.0