Comment #4 on issue 2851 by [email protected]: logcombine(log(3) - log(2)) does nothing
http://code.google.com/p/sympy/issues/detail?id=2851
Right, I had forgotten about that, but if you step through the code, you can see that it doesn't even try to return log(3/2), and there is the same problem with logcombine(log(x) - log(2)): it should return log(x/2) (which isn't autoconverted back to log(x) - log(2)) but it doesn't.
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