#9220: Upredictable parent for polynomial evaluation
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Reporter: nbruin | Owner: robertwb
Type: defect | Status: new
Priority: major | Milestone: sage-4.4.4
Component: coercion | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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I doubt that it is intended that the names of the variables of a
polynomial ring can affect the parent of the result of evaluating such a
polynomial:
{{{
sage: R=QQ['x']
sage: S=QQ['x','y']
sage: h=S.0^2
sage: parent(h(R.0,0))
Multivariate Polynomial Ring in x, y over Rational Field
sage: R=QQ['x']
sage: S=QQ['u','v']
sage: h=S.0^2
sage: parent(h(R.0,0))
Univariate Polynomial Ring in x over Rational Field
}}}
I would expect the result of the second example in both cases.
In
http://groups.google.com/group/sage-
devel/browse_thread/thread/4607f62126303ddd?pli=1
John Cremona mentions #8502 as fixing a different but similar issue.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9220>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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