#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 AlexGhitza):
Did you try the whole thing, including {{{pari('v')}}} and {{{pari('u')}}}
?
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}}}. It's a shame that it
doesn't work out of the box. In fact, I would even like something like
the following to work:
{{{
sage: R.<u, v> = QQ[]
sage: f = v^3 - u^7 + 2*u^3*v
sage: f.discriminant(v)
}}}
Anyway, it's beyond the scope of this ticket. I might open an enhancement
ticket about it.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6237#comment:6>
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