more interesting integration examples about sympy-paper HOT 3 CLOSED

We should have one indefinite example that uses Risch, and one definite example that uses meijerg.

from sympy-paper.

And we need a summation example (or two, if we want one for Gosper and one for Meijer G), and a product example (product can't do much, so probably just something simple there).

from sympy-paper.

This is done. Hopefully the examples are good. For meijerg, it took some looking to find an example that didn't return a huge piecewise expression. I ended up doing the Laplace Transform of log(t). For Risch, I just made up an example, which looks complicated enough (but is easy for the algorithm to compute).

from sympy-paper.