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Question: Error Maple 15,

Question:Error Maple 15,

MySelf19 10 Maple
September 02 2011
1

Hello,

 

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

  L:=4:

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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