Comment #2 on issue 2851 by [email protected]: logcombine(log(3) - log(2))
does nothing
http://code.google.com/p/sympy/issues/detail?id=2851
It's because we have:
In [46]: log(S(3)/2)
Out[46]: -log(2) + log(3)
so obviously it's impossible for logcombine to combine them. Perhaps this
should be removed? We also automatically pull out perfect powers:
In [47]: log(16)
Out[47]: 4⋅log(2)
In [49]: log(S(16)/9)
Out[49]: -2⋅log(3) + 4⋅log(2)
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