Comment #7 on issue 2026 by ronan.l...@gmail.com: Exact, algebraic, and integer_power substitution
http://code.google.com/p/sympy/issues/detail?id=2026
The third case is really specific and it's just a detail of the behaviour of algebraic substitution, so I don't think it should placed on the same level as the other two.
Now, concerning exact substitution, it's really not the same thing as algebraic substitution (e.g. it makes sense for all Basic objects, not just for Expr) so it should have its own method. I'm not sure about the name, 'replace' maybe (it's been suggested for something different in issue 1337, though).
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