Comment #8 on issue 2851 by [email protected]: logcombine(log(3) - log(2)) does nothing
http://code.google.com/p/sympy/issues/detail?id=2851
I don't mind if the autoevaluation goes away, but the logic for it should not be duplicated (which makes tracking down logic errors difficult). Could eval be given a keyword so that expansion can be done optionally (e.g. not at instantiation but log expand could call the routine to have it autoexpand). It would be nice to allow sqrt to not autocombine, too, so sqrt(2) + x*sqrt(10) could be expanded and factored to sqrt(2)*(1 + x*sqrt(5)).
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