Am 19.01.2015 um 22:14 schrieb Amit Saha:
I am of the same opinion too. The first impression that I get when I see NotImplementedError is that, it is not currently implemented and thus is probably a limitation of SymPy and not that it is perhaps not just possible to get the solution/answer.
Well, do we give a different error message for those problems that are unsolvable? Otherwise, the unsolvable ones are going to always give you NotImplementedError.
I'm assuming that SymPy does not even attempt to identify unsolvable problems. If that is indeed true, "unsolvable" is a proper subset of "not implemented", at least from SymPy's perspective, and SymPy does not distinguish between the two.
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