Comment #2 on issue 3681 by [email protected]: bottom_up runs into problem with Pow
http://code.google.com/p/sympy/issues/detail?id=3681

How about on this one:

rebuild(bottom_up(lambda x: expand(x))(x+x*(x+1)))
...
  File "sympy\simplify\simplify.py", line 91, in fraction
    if term.is_commutative and (term.is_Pow or term.func is exp):
AttributeError: is_commutative

Part of the motivation for doing this right now (and something that is attractive about this bottom_up) is that I can do an operation, get an arg count, and then do the rebuild and see if things simplified or not. Something like `(x+y)*(x-y) - x**2` would expand to `x**2 + 2*x - y**2 - x**2` and then on rebuild would drop to 2 terms, representing a favorable expansion.

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