Opened 8 years ago
Last modified 5 years ago
#12803 new defect
quotient of ideals throws up Singular bug
Reported by: | mariah | Owned by: | malb |
---|---|---|---|
Priority: | major | Milestone: | sage-6.4 |
Component: | commutative algebra | Keywords: | |
Cc: | malb | Merged in: | |
Authors: | Reviewers: | ||
Report Upstream: | Fixed upstream, in a later stable release. | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: | #17679 |
Description (last modified by )
This is a bug in Singular 3.1.7 (fixed in 4.0.1, see ticket #17254):
R.<xe,xv> = ZZ[] J = Ideal(4*xv^3+3*xv^2, 3*xe*xv^2+xe-2*xv); I = Ideal(-3, -3*xv-1, -3); I2 = Ideal(-3, -3*xv-1); assert( I == I2 ) Q1 = J.quotient(I) # wrong Q2 = J.quotient(I2) assert( Q1 == Q2 ) # fails
Change History (11)
comment:1 Changed 7 years ago by
- Cc malb added
- Component changed from algebra to commutative algebra
- Owner changed from AlexGhitza to malb
comment:2 Changed 6 years ago by
- Milestone changed from sage-5.11 to sage-5.12
comment:3 Changed 6 years ago by
- Milestone changed from sage-6.1 to sage-6.2
comment:4 Changed 6 years ago by
comment:5 Changed 5 years ago by
- Milestone changed from sage-6.2 to sage-6.3
comment:6 Changed 5 years ago by
- Milestone changed from sage-6.3 to sage-6.4
comment:7 Changed 5 years ago by
- Report Upstream changed from N/A to Fixed upstream, in a later stable release.
comment:8 Changed 5 years ago by
the bug above is fixed by upgrade to Singular 3.1.7
but there is at least another one (fixed in 4.0.1, see ticket #17254):
R.<xe,xv> = ZZ[] J = Ideal(4*xv^3+3*xv^2, 3*xe*xv^2+xe-2*xv); I = Ideal(-3, -3*xv-1, -3); I2 = Ideal(-3, -3*xv-1); assert( I == I2 ) Q1 = J.quotient(I) # wrong Q2 = J.quotient(I2) assert( Q1 == Q2 ) # fails
comment:9 Changed 5 years ago by
- Description modified (diff)
comment:10 Changed 5 years ago by
- Stopgaps set to #17679
comment:11 Changed 5 years ago by
- Description modified (diff)
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This bug (and some others) are fixed in recent Singular:
(offtopic: are all known Singular-bugs reported upstream? )
However, I recall that there are some issues when considering updating Singular :