Comment #2 on issue 3649 by [email protected]: integrate(x**x*log(x))
gives 0
http://code.google.com/p/sympy/issues/detail?id=3649
This reveals a much more serious problem, which I suspect is rampant
throughout SymPy. The problem was that Integral._eval_subs was returning
an Integral, so that NonElementaryIntegral.subs gave an Integral, and hence
failed an isinstance check.
All methods of classes that return another instance of that class should
return self.func(*args) instead of Class(*args). That way, if someone
subclasses that class, it will give the subclass, not the superclass. I
opened issue 3652 for that.
I'm having SSH issues right now, but as soon as they are fixed, I'll open a
pull request with the fix.
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