Comment #2 on issue 3262 by [email protected]: CSE loses factor
of I (imag. unit)
http://code.google.com/p/sympy/issues/detail?id=3262
There are really multiple layers of breakage here.
- First, I.as_base_exp() returns (-1, 1/2). I doubt this is wise--see next
point.
- breakup() within Mul._eval_subs() then adds up exponents of (-1),
yielding (-1)**(3/2), which sympy justifiedly rejects as undefined.
- That error really never comes to pass, though, because Mul._eval_subs()
throws away the coefficient (and all its powers) if it was able to
multiplicatively_extract() them. Unfortunately, it assumes that the
entire 'coefficient' is contained in the first arg of the Mul, which is
untrue in this case.
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