The problem seems to rather be that FiniteSet does not print canonically.

On 19.06.2012 09:44, Aaron Meurer wrote:
We used to have this problem a lot, but then we made all printing
ordering canonical with sort_key. I suppose you should make sure that
the new category theory class printers use this.

Where did it come up in the ODE solvers?

Aaron Meurer

On Jun 19, 2012, at 2:35 AM, "[email protected]"
<[email protected]>  wrote:

There are some doctests in category theory that rely on the order of
printing of tests and fail when the ordering changes.
http://reviews.sympy.org/report/agZzeW1weTNyDAsSBFRhc2sYh9MbDA

I had some similar issues with the ODE solvers.

Any general way to address such issues?

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