Comment #3 on issue 1434 by ondrej.certik: substitution doesn't work for
sqrt()
http://code.google.com/p/sympy/issues/detail?id=1434
When writing the tests, please test all the code here:
if base.is_positive:
return result
elif exp.q == 2:
+ return result
+ print "exp", exp
return result * S.ImaginaryUnit
else:
return result * ((-1)**exp)
e.g. it'd be nice to figure out why the case exp.q is a special case, e.g.
does it
work for 1/4? 1/6? 1/8? and then probably write it as:
if base.is_positive or exp.q == 2:
return result
else:
return return result * ((-1)**exp)
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