Question: Error Maple 15,

Question:Error Maple 15,

MySelf19 10 Maple



I have an error in Maple 15, I dont understand why it doesnt work. I mention that in Maple 13 it works:


The code is


sum(diff( (x^2-1)^l,x$l),l=0..L);


The error is:

Error, (in SumTools:-DefiniteSum:-ClosedForm) summand is singular in the interval of summation


Somebody can help me, please?

Thank you

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