Comment #150 on issue 1694 by asmeurer: solve has many issues with fractions http://code.google.com/p/sympy/issues/detail?id=1694
No, that is wrong. The positive and real are referring to different things. For a*log(x) == log(x**a) to be correct, a must be real, but for log(x) + log(y) to be correct, x and y must be positive (or else you get complex logarithms). It should say something like this in the logcombine() docstring.
And no other function uses that keyword because I totally made it up when I wrote logcombine :)
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