Opened 12 years ago
Closed 11 years ago
#6228 closed defect (fixed)
[with patch, positive review] Wrong multiplicities when solving a univariate polynomial equation
Reported by: | SimonKing | Owned by: | |
---|---|---|---|
Priority: | major | Milestone: | sage-4.2 |
Component: | symbolics | Keywords: | multiplicities solve |
Cc: | Merged in: | sage-4.2.alpha0 | |
Authors: | Karl-Dieter Crisman | Reviewers: | Mike Hansen |
Report Upstream: | Work issues: | ||
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
At http://groups.google.com/group/sage-support/browse_thread/thread/d8e22deb18d97253 Michael Friedman asked how to get the multiplicities when solving a set of nonlinear equations.
It turns out that actually even the multiplicities for a single and rather simple equation are wrong:
---------------------------------------------------------------------- | Sage Version 4.0, Release Date: 2009-05-29 | | Type notebook() for the GUI, and license() for information. | ---------------------------------------------------------------------- sage: z = var('z') sage: solve((z^3-1)^3,z,multiplicities=True) ([z == (sqrt(3)*I - 1)/2, z == (-sqrt(3)*I - 1)/2, z == 1], [1, 1, 3])
I am afraid that symbolics isn't my field of expertise. So, I don't know how to cure it.
Attachments (1)
Change History (5)
comment:1 Changed 12 years ago by
comment:2 Changed 11 years ago by
- Milestone changed from sage-4.1.2 to sage-4.1.3
- Summary changed from Wrong multiplicities when solving a univariate polynomial equation to [with patch, needs review] Wrong multiplicities when solving a univariate polynomial equation
This is now fixed, presumably in the Maxima upgrade.
comment:3 Changed 11 years ago by
- Reviewers set to Mike Hansen
- Summary changed from [with patch, needs review] Wrong multiplicities when solving a univariate polynomial equation to [with patch, positive review] Wrong multiplicities when solving a univariate polynomial equation
Looks good to me.
comment:4 Changed 11 years ago by
- Merged in set to sage-4.2.alpha0
- Resolution set to fixed
- Status changed from positive_review to closed
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Note that it seems to be a problem in
maxima
:
So, I suspect this ticket will get a "won't fix"...