Comment #12 on issue 1799 by smichr: Replace exp(x) with E**x internally
http://code.google.com/p/sympy/issues/detail?id=1799
I think that perhaps the way to do this is leave exp alone. It has several
methods that would become messy to handle--just my hunch. How about this,
though:
1) give expr a property ".is_pow" which is False
2) override in Pow and exp with being True
3) give exp the properties .base and .exp
Now when you don't care if you get a Pow or exp, ask if eq.is_pow and if it
is, proceed as usual with the base and exp.
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