See the answers to these ask-sage questions:
http://ask.sagemath.org/question/7820/fractional-power-to-negative-number/
http://ask.sagemath.org/question/10063/get-variants-of-complex-cube-root/
---------- Forwarded message ----------
My name's André, I from Brazil. I have a question: Why a cubic root of -1
(n((-1)^(1/3)))
in Sage Math is: 0.500000000000000 + 0.866025403784439*I? Not and is -1?
Thank you!
André Xavier
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