Comment #2 on issue 1229 by [email protected]: Simplification of sqrts
http://code.google.com/p/sympy/issues/detail?id=1229
So it gives the correct answer but one should use logcombine on the result.
logcombine will only combines the logarithms if their arguments are
positive. So:
In [51]: s = Symbol('s', positive=True)
In [52]: y = Symbol('y', positive=True)
In [53]: t = -2*log(s) + 2*log(1/y) - log(pi) - log(2)
In [54]: logcombine(t)
Out[54]:
/ 1 \
log|--------| - log(2)
| 2 2|
\pi*s *y /
Somehow, it does not combine the log(2).
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