On Wed, Feb 6, 2013 at 8:46 AM, Matthew Rocklin <[email protected]> wrote: > Rewrite rules don't respect the canonicalization that happens at expression > construction time. If this is important to you then inject the `rebuild` > rule which effectively does type(x)(*map(rebuild, x.args)) > > Here is my solution to your problem > > In [1]: from sympy.rules import chain, rebuild, debug, typed > In [2]: from sympy.rules.traverse import bottom_up > In [3]: e = y*(x + 3) - y
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