issue #7827 understanding.

[Gaurav Dhingra]

It's really silly but may i know that " am i supposed to write some code for this issue". I am new to sympy. I have been through the tutorial of sympy http://docs.sympy.org/latest/tutorial/ ..
and also suggest some method to solve this paricular issue.

[Tim Lahey]

If you look at summation.py (inside the concrete directory), you'll see
that there's an _eval_derivative function. What summation.py needs to
evaluate integrals is the corresponding function for integrals,
_eval_integral. Look at integrals.py and some of the other classes that
implement it. It should be pretty straightforward to implement.

I hope that helps.

Cheers,

Tim.

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