Comment #5 on issue 2571 by [email protected]: Regression in Integral.subs http://code.google.com/p/sympy/issues/detail?id=2571
Should `Integral(x, x).subs(x, 5).doit()` be 25 or 25/2? You get 25 if you allow subs to target the dummy x of the integrand and the x of the limit `Integral(x, (x, x)).subs(x, 5) -> Integral(5, (x, 5))` and 25/2 if you only let it target the non-dummy x and give `Integral(x, (x, 5))`.
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