#11900: Serious regression caused by #9138
----------------------------------------------------------------------------------------+
Reporter: SimonKing
| Owner: tbd
Type: defect
| Status: needs_work
Priority: critical
| Milestone: sage-4.8
Component: performance
| Keywords: categories regression
Work_issues: Laurent series rings are fields. Add docs. Don't use is_ring and
friends | Upstream: N/A
Reviewer: Jeroen Demeyer, Nicolas M. Thiéry
| Author: Simon King
Merged:
| Dependencies: #9138 #11911
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Changes (by SimonKing):
* work_issues: finalize the patch with the different ideas that have
been explored => Laurent series rings
are fields. Add docs. Don't use is_ring
and friends
Comment:
Some of the errors are due to the fact that still some fields are not
initialised as fields. For example: Laurent series rings.
{{{
sage: P = QQ[['x']]
sage: F = Frac(P)
sage: F.is_field()
True
sage: F.category()
Category of rings
}}}
So, here is yet another case of a parent whose category should better be
properly initialised.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11900#comment:116>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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