Opened 9 years ago
Closed 9 years ago
#10767 closed defect (fixed)
Fractional ideals intersection gives wrong answers in some cases.
| Reported by: | mderickx | Owned by: | was |
|---|---|---|---|
| Priority: | major | Milestone: | sage-4.8 |
| Component: | number theory | Keywords: | PARI |
| Cc: | jdemeyer, leif, cremona | Merged in: | sage-4.8.alpha1 |
| Authors: | Jeroen Demeyer | Reviewers: | John Cremona |
| Report Upstream: | Fixed upstream, in a later stable release. | Work issues: | |
| Branch: | Commit: | ||
| Dependencies: | #11130 | Stopgaps: |
Description (last modified by )
Here is an explicit example:
sage: var('x')
sage: K=QQ.extension(x,'x')
sage: (K*(1/4)).intersection(K*(1/4))
Fractional ideal (1/16)
Apply 10767_doctest.patch to the Sage library.
(The issue is fixed by #11130, upgrading PARI, but the patch adds a corresponding doctest, so this ticket is not a duplicate.)
Attachments (1)
Change History (16)
comment:1 Changed 9 years ago by
comment:2 Changed 9 years ago by
I've reported it to Pari.
comment:3 Changed 9 years ago by
- Report Upstream changed from N/A to Reported upstream. Developers acknowledge bug.
I saw it indeed: http://pari.math.u-bordeaux.fr/cgi-bin/bugreport.cgi?bug=1192
comment:4 Changed 9 years ago by
- Cc jdemeyer added
- Report Upstream changed from Reported upstream. Developers acknowledge bug. to Fixed upstream, but not in a stable release.
It's been fixed in Pari, so updating Pari would most likely fix this bug.
comment:5 Changed 9 years ago by
The new PARI spkg at #11130 should fix this.
Please add a doctest here to ensure the problem is fixed.
Changed 9 years ago by
comment:6 Changed 9 years ago by
- Dependencies set to #11230, #11234, #11130
- Status changed from new to needs_review
comment:7 follow-up: ↓ 8 Changed 9 years ago by
- Cc leif cremona added
- Dependencies changed from #11230, #11234, #11130 to #11130
- Report Upstream changed from Fixed upstream, but not in a stable release. to Fixed upstream, in a later stable release.
Could anybody please review the fact that #11130 fixes this problem and that the doctest is good?
comment:8 in reply to: ↑ 7 Changed 9 years ago by
comment:9 Changed 9 years ago by
- Status changed from needs_review to positive_review
Patch applies fine to 4.7.2.alpha2 + patches from #11130, and successfully demonstrates that the bug no longer exists.
comment:10 Changed 9 years ago by
- Description modified (diff)
- Keywords PARI added
- Reviewers set to John Cremona
- Summary changed from Fractional ideals intersection gives wrong awnsers in some cases. to Fractional ideals intersection gives wrong answers in some cases.
comment:11 Changed 9 years ago by
- Milestone changed from sage-4.7.2 to sage-4.7.3
comment:12 Changed 9 years ago by
- Milestone changed from sage-4.7.3 to sage-pending
comment:13 Changed 9 years ago by
- Milestone changed from sage-pending to sage-4.7.3
comment:15 Changed 9 years ago by
- Merged in set to sage-4.8.alpha1
- Milestone set to sage-4.8
- Resolution set to fixed
- Status changed from positive_review to closed
This seems to be a bug in Pari:
GP/PARI CALCULATOR Version 2.4.3 (development svn-12623) i386 running darwin (x86-64/GMP-4.2.1 kernel) 64-bit version compiled: Mar 4 2011, gcc-4.2.1 (Apple Inc. build 5664) (readline v6.1 enabled, extended help enabled) Copyright (C) 2000-2008 The PARI Group PARI/GP is free software, covered by the GNU General Public License, and comes WITHOUT ANY WARRANTY WHATSOEVER. Type ? for help, \q to quit. Type ?12 for how to get moral (and possibly technical) support. parisize = 8000000, primelimit = 500509 ? K = nfinit(x^2-2) %1 = [x^2 - 2, [2, 0], 8, 1, [[1, -1.4142135623730950488016887242096980786; 1, 1.4142135623730950488016887242096980786], [1, -1.4142135623730950488016887242096980786; 1, 1.4142135623730950488016887242096980786], [1, -1; 1, 1], [2, 0; 0, 4], [4, 0; 0, 2], [2, 0; 0, 1], [2, [0, 2; 1, 0]]], [-1.4142135623730950488016887242096980786, 1.4142135623730950488016887242096980786], [1, x], [1, 0; 0, 1], [1, 0, 0, 2; 0, 1, 1, 0]] ? a = idealhnf(K, 1/2) %2 = [1/2 0] [0 1/2] ? idealintersect(K, a, a) %3 = [1/4 0] [0 1/4]