#11941: Solve and assumptions too aggressive with cube root of negative numbers
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Reporter: kcrisman | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-4.8
Component: symbolics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by kcrisman):
> I wonder why maxima is returning `(-1)^(1/3)`. Maybe we should ask the
Maxima developers.
No, no! See this example from the description:
{{{
(%i2) display2d:false;
(%o2) false
(%i3) solve(x^3+1=0,x);
(%o3) [x = -(sqrt(3)*%i-1)/2,x = (sqrt(3)*%i+1)/2,x = -1]
}}}
We are somehow getting the {{{(-1)^(1/3)}}} by doing something nonstandard
in Maxima, apparently. But their vanilla thing is just right.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11941#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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