#15605: (-1)^(2/3) evaluates to 1
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Reporter: mmezzarobba | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by rws):
Replying to [comment:7 tmonteil]:
> If one want to have something that both:
> - applies rules such as `a^(bc) = (a^b)^c` systematically,
> - takes principal branches of multi-valued complex function when
evaluating,
> then we should accept that kind of behaviour.
I think that with `bc` numeric (and it only makes sense to me if rational)
and `a` negative the rule `a^(bc) = (a^b)^c` should not be applied simply
because then `a^b` loses information. With symbolic exponent the user will
probaby expect simplification.
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Ticket URL: <http://trac.sagemath.org/ticket/15605#comment:8>
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