#15605: (-1)^(2/3) evaluates to 1
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Reporter: mmezzarobba | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by mmezzarobba:
Old description:
> Likely a duplicate, but I couldn't find it elsewhere...
> {{{
> sage: (-1)^(2/3)
> 1
> }}}
>
> Of course, this is inconsistent with virtually all interpretations and
> conversions of symbolic expressions...
> {{{
> sage: CC(-1)^(2/3)
> -0.500000000000000 + 0.866025403784439*I
> sage: QQbar(-1)^(2/3)
> -0.500000000000000? + 0.866025403784439?*I
> sage: RR(-1)^(2/3)
> -0.500000000000000 + 0.866025403784439*I
> }}}
>
> Also:
> {{{
> sage: (-1)^(-1/3)
> -1
> }}}
New description:
Likely a duplicate, but I couldn't find it elsewhere...
{{{
sage: (-1)^(2/3)
1
}}}
Of course, this is inconsistent with virtually all interpretations and
conversions of symbolic expressions...
{{{
sage: CC(-1)^(2/3)
-0.500000000000000 + 0.866025403784439*I
sage: QQbar(-1)^(2/3)
-0.500000000000000? + 0.866025403784439?*I
sage: RR(-1)^(2/3)
-0.500000000000000 + 0.866025403784439*I
}}}
Also:
{{{
sage: (-1)^(-1/3)
-1
}}}
{{{
sage: (-1)^(1/3)*(-1)^(1/5)
1
}}}
}}}
--
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Ticket URL: <http://trac.sagemath.org/ticket/15605#comment:2>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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