Comment #9 on issue 2851 by [email protected]: logcombine(log(3) - log(2)) does nothing
http://code.google.com/p/sympy/issues/detail?id=2851

are you referring to the discussion on  issue 2397  ?

No, that wasn't it. There was some lengthy discussion that we had about what logs should do with numeric arguments.

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)).

But that can already work:

In [117]: sqrt(2)*(1 + x*sqrt(5))
Out[117]:
  ___ ⎛  ___      ⎞
╲╱ 2 ⋅⎝╲╱ 5 ⋅x + 1⎠


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