#15710: Singular hangs in division of rational functions over cyclotomic field
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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:
Dependencies: #14333 | Stopgaps:
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Changes (by jdemeyer):
* commit: 13573a935764c03692d67661fbc31fa3cedf1349 =>
* branch: u/jdemeyer/ticket/15710 =>
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 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.
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.
Ticket #15717 fixes the "cannot be interrupted" part of the bug.
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Ticket URL: <http://trac.sagemath.org/ticket/15710#comment:11>
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