Opened 4 years ago
Last modified 15 months ago
#18598 new defect
reduce method of polynomial ideals gives incorrect results
Reported by: | lftabera | Owned by: | |
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Priority: | major | Milestone: | sage-8.4 |
Component: | algebra | Keywords: | days94 |
Cc: | Merged in: | ||
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
The following fails
sage: K=PolynomialRing(QQ,'x,y,a0,a1',order=TermOrder('degrevlex',2)+TermOrder('degrevlex',2)) sage: x,y,a0,a1=K.gens() sage: f = x**3+x**2*y sage: m = Ideal(x**4,x**2*y,y**2) sage: m.reduce(f) == f.reduce(m.groebner_basis()) False sage: m.reduce(f) x^3 + x^2*y sage: f.reduce(m.groebner_basis()) x^3
The reduction should be x^3
. Singular computes correctly the reduction, so the problem is in the Sage library.
Change History (3)
comment:1 Changed 16 months ago by
- Keywords days94 added
- Milestone changed from sage-6.8 to sage-8.3
comment:2 Changed 16 months ago by
comment:3 Changed 15 months ago by
- Milestone changed from sage-8.3 to sage-8.4
update milestone 8.3 -> 8.4
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I am not able to debug this. For me, it seems that this is an error in libsingular and, probably, a duplicate of #12529