Comment #2 on issue 2830 by [email protected]: checkodesol needs to use force http://code.google.com/p/sympy/issues/detail?id=2830
Things are seldom as easy as they appear. My hunch is that you will have to track down where and how expand is being used and then make the force=True change. And when that doesn't work (I now know that doing this at line 1186 is not sufficient) then you have to figure out where such an expansion should go while not breaking anything. This requires understanding the routine. And then my nemesis (the test_ode.py suite :-)) will then need to be modified if things change.
It will appear easy once the answer is known, but right now it looks like about a medium difficulty problem to me. YMMV. That was just my estimation based on experience. If someone tackles this they can ring in about the difficulty. Hopefully I'm wrong and this is a cherry...but herrings can also be red ;-)
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