Hi guys, how are you all doing? I hope that you are all doing fine!
So, I just started to make use of Mathematica few months ago, therefore I dont know if it's a silly question. I have the following the kind of term to be simplified
Sum[{A[l, l1, i, j, k, l]/B[j, j + 1, i, j]} KroneckerDelta[i, l], {i, 0, \[Infinity]}]
However, looks like that Mathematica is not able to solve it. It just returns the same expression. But, if I change the Kronecker delta argument to [i,10], instead of [i,l], the sum is simplified.
I'd like to know if there's a way to simplify this kind of expression, since it does simplify this kind of sum, if there is no fraction. I mean:
Sum[A[l, l1, i, j, k, l] KroneckerDelta[i, l], {i, 0, \[Infinity]}]