Comment #15 on issue 2026 by ronan.l...@gmail.com: Exact, algebraic, and integer_power substitution
http://code.google.com/p/sympy/issues/detail?id=2026
So, this means that expr.replace(...) could be used as a primitive to do all kinds of transformations on expressions, including simplify(), expand(), etc. But, thinking a bit more about it, general transformations are more easily expressed as functions, so the fundamental primitive should rather be something like replace() but taking a function instead of a dict.
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