Comment #4 on issue 2047 by smichr: subs_atoms should omit more variables when doing subs in Integral
http://code.google.com/p/sympy/issues/detail?id=2047
I believe I merged it all together in "50d489d subs-wild..." If you pull it, checkout that commit. The last two commits are under construction.
Let me try again about the integral issue. When you have Integral(x, (x, 1, y)) the x is a variable of integration. What we need to decide is when the user says i.subs(x, 2) whether that x should be targeted. IMO, no, in neither place. Even though it's a regular sympy variable, it has special semantics in this context. I didn't mean that one should try calculate the integral, only that we should only target variables that will be present in the final integral (which is partly why I wrote the Integral.symbols method).
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