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Oct 16, 2012 at 10:37 comment added Stefano Capparelli Thank you! This is indeed a nice short proof. I am new here and if I have to choose a single answer as a preferred answer I am going to go for Pietro's as it also gives me a proof of the natural extension of the summation formulas. Of course, you might also be right that the actual Mathematica procedure is a different story. Thanks to all those that took interest in this.
Oct 16, 2012 at 10:28 vote accept Stefano Capparelli
Oct 16, 2012 at 10:28
Oct 11, 2012 at 18:06 history answered Ira Gessel CC BY-SA 3.0