#6160: Segmentation Fault with Multivariate Polynomial Ring
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Reporter: stankewicz | Owner: somebody
Type: defect | Status: new
Priority: major | Milestone:
Component: algebra | Keywords:
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This is an example over a 2- variable polynomial ring over QQ (although
sage does not see K as isomorphic to QQ
lo...@sage:~$ sage
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| Sage Version 3.4.1, Release Date: 2009-04-21 |
| Type notebook() for the GUI, and license() for information. |
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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).
------------------------------------------------------------
lo...@sage:~$
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).
------------------------------------------------------------
lo...@sage:~$
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6160>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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