#6237: repeated roots with roots(CDF, multiplicities=False)
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Reporter: ncalexan | Owner: somebody
Type: defect | Status: positive_review
Priority: major | Milestone: sage-4.3.1
Component: basic arithmetic | Keywords: roots CDF multiplicities
Work_issues: | Author: Alex Ghitza
Upstream: N/A | Reviewer: Karl-Dieter Crisman
Merged: |
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Comment(by kcrisman):
Replying to [comment:6 AlexGhitza]:
> Did you try the whole thing, including {{{pari('v')}}} and
{{{pari('u')}}} ?
Yes. Again, oddly enough, the same thing did work when I tried it on
sage.math, so it must be highly sensitive to something, though not sure
what - maybe I had typed in something earlier that made it work/not work.
>
> It seems to work for me. Of course, if I had written the example I
would have tried something like
>
> {{{
> sage: R.<u> = QQ[]
> sage: S.<v> = R[]
> sage: f = v^3 - u^7 + 2*u^3*v
> sage: f.discriminant()
> }}}
>
> This does indeed fail with a {{{PariError(8)}}}. And this is apparently
documented in the docstring for {{{discriminant}}}.
Huh. Well, glad to know it.
> Anyway, it's beyond the scope of this ticket. I might open an
enhancement ticket about it.
Go for it, though I won't be able to help on it.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6237#comment:7>
Sage <http://www.sagemath.org>
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