Opened 12 years ago
Closed 11 years ago
#6160 closed defect (duplicate)
Segmentation Fault with Multivariate Polynomial Ring
Reported by: | stankewicz | Owned by: | somebody |
---|---|---|---|
Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |
Component: | algebra | Keywords: | singular |
Cc: | malb, wjp | Merged in: | |
Authors: | Burcin Erocal | Reviewers: | |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description (last modified by )
This is an example over a 2- variable polynomial ring over QQ (although sage does not see K as isomorphic to QQ)
---------------------------------------------------------------------- | Sage Version 3.4.1, Release Date: 2009-04-21 | | Type notebook() for the GUI, and license() for information. | ---------------------------------------------------------------------- sage: K.<j> = NumberField(x-1728) sage: R.<b,c> = K[] sage: f = b-j*c ------------------------------------------------------------ Unhandled SIGSEGV: A segmentation fault occured in SAGE. This probably occured because a *compiled* component of SAGE has a bug in it (typically accessing invalid memory) or is not properly wrapped with _sig_on, _sig_off. You might want to run SAGE under gdb with 'sage -gdb' to debug this. SAGE will now terminate (sorry). ------------------------------------------------------------
Note that this does not pose a problem if the number field is not QQ
sage: K.<j> = NumberField(x^2 - 2) sage: R.<b,c> = K[] sage: f = b-j*c sage: f b + (-j)*c
Nor if the Polynomial Ring is Univariate
sage: F.<i> = NumberField(x-1728) sage: S.<y> = F[] sage: y - i y - 1728 sage: g = y - i sage: g = i*y^2 + 1 sage: g 1728*y^2 + 1
Also note that this has nothing to do with Pari's occasional trouble with the ordering of variables
sage: K.<j> = NumberField(x-1728) sage: R.<k,l> = K[] sage: f = k - j*l ------------------------------------------------------------ Unhandled SIGSEGV: A segmentation fault occured in SAGE. This probably occured because a *compiled* component of SAGE has a bug in it (typically accessing invalid memory) or is not properly wrapped with _sig_on, _sig_off. You might want to run SAGE under gdb with 'sage -gdb' to debug this. SAGE will now terminate (sorry). ------------------------------------------------------------
Change History (2)
comment:1 Changed 12 years ago by
- Description modified (diff)
comment:2 Changed 11 years ago by
- Cc malb wjp added
- Keywords singular added
- Milestone set to sage-duplicate/invalid/wontfix
- Report Upstream set to N/A
- Resolution set to duplicate
- Status changed from new to closed
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The patch attached to #7582 fixes this. I'm closing this as a duplicate.