Comment #13 on issue 2205 by ronan.l...@gmail.com: "Undefined functions" http://code.google.com/p/sympy/issues/detail?id=2205
@Alexey: This is only indirectly related to issue 1688. It just clarifies the current code without changing the internal design, which probably helps towards finding a good solution for 1688.
What you discuss is actually relevant to issue 1688, not to this one. Clarifying problems, creating a wiki page, etc. would certainly help a lot. I won't really have time to do it myself until the 0.7.0 release.
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