Comment #2 on issue 2709 by [email protected]: logcombine isn't as simple as it could be
http://code.google.com/p/sympy/issues/detail?id=2709

The issue is that logcombine does not work with the deep concept, so bottom_up can/should be used if that is desired (or logcombine modified to allow for that option):

var('x y', positive=1)
(x, y)
bottom_up(log(2)/(log(x)+log(y)), logcombine)
log(2**(1/log(x*y)))



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