Comment #10 on issue 2193 by smi...@gmail.com: Matrix.eigenvects() return
empty vectors in some cases
http://code.google.com/p/sympy/issues/detail?id=2193
Regarding
>>> sqrt(-2*I)
(-1)**(3/4)*2**(1/2)
sqrt could be modified to detect `sqrt(-pos*I)` and return `b - b*I` where
`b = sqrt(pos)/sqrt(2)`.
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