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Comment #6 on issue 1827 by asmeurer: log eval gives more standard form
http://code.google.com/p/sympy/issues/detail?id=1827
This seems similar to factoring integers so that we can simplify sqrt(75)
--> 5*sqrt(3). But the power eval
code has a fail safe that it won't attempt to factor large integers.
Something like that should be added here.
Who's to stop someone from typing something crazy like
log(3758743295473825947389257438957432890574389205744372819437281947382914738921473892
1748392714839271498321), which hangs in Chris's branch.
Also, there is logcombine, which is perfectly capable of handling more
complex things like ln(10)-ln(2)-ln(5),
which I should note that Maple does not autosimplify:
In [6]: logcombine(ln(10)-ln(2)-ln(5))
Out[6]: 0
ln(10)-ln(2)-ln(5);
ln(10) - ln(2) - ln(5)
So I think we should at least leave that one alone in eval.
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