#15710: Singular hangs in division of rational functions over cyclotomic field
-------------------------------------+-------------------------------------
Reporter: ppurka | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.1
Component: number fields | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/15710 | 13573a935764c03692d67661fbc31fa3cedf1349
Dependencies: | Stopgaps:
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Changes (by jdemeyer):
* commit: => 13573a935764c03692d67661fbc31fa3cedf1349
Old description:
> From the [https://spreadsheets.google.com/pub?key=pCwvGVwSMxTzT6E2xNdo5fA
> google notebook bug reports]
>
> This hangs and cannot be interrupted:
> {{{
> sage: F.<a>=CyclotomicField(49); G = F['z,w'].fraction_field(); 1/G(a^28
> + a^23 - 1)
> }}}
>
> The problem is likely a bug in Singular.
New description:
From the [https://spreadsheets.google.com/pub?key=pCwvGVwSMxTzT6E2xNdo5fA
google notebook bug reports]
This hangs and cannot be interrupted:
{{{
sage: F.<a>=CyclotomicField(49); G = F['z,w'].fraction_field(); 1/G(a^28 +
a^23 - 1)
}}}
The problem depends on the value that we are dividing by: `1/G(a^28 + a^23
+ 1)` works and returns the correct value.
The attached branch fixes the "cannot be interrupted" part of the bug.
--
Comment:
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=1753f06bb356908e5d3317f4d92c00421bde93ba
1753f06]||{{{Update Singular to version 3-1-6.}}}||
||[http://git.sagemath.org/sage.git/commit/?id=536a31f920117a8d048447f6b7a7477bcffc213a
536a31f]||{{{Update Singular function interface to API changes in Singular
3.1.6.}}}||
||[http://git.sagemath.org/sage.git/commit/?id=dd469911d19ed7080fecdb90f8773c487c744a9b
dd46991]||{{{Remove description of deleted patches.}}}||
||[http://git.sagemath.org/sage.git/commit/?id=0a702e99e888ff087ad061cc0a0d11d68c336c31
0a702e9]||{{{Merge commit 'dd469911d19ed7080fec' into ticket/15710}}}||
||[http://git.sagemath.org/sage.git/commit/?id=13573a935764c03692d67661fbc31fa3cedf1349
13573a9]||{{{Add some sig_on() blocks to Singular interface}}}||
--
Ticket URL: <http://trac.sagemath.org/ticket/15710#comment:5>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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