#11316: Weighted degree term orders added
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Reporter: klee | Owner: AlexGhitza
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.1
Component: basic arithmetic | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Kwankyu Lee
Merged: | Dependencies:
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Comment(by SimonKing):
Or it can be solved on the side of Sage. Namely, while Singular does not
allow the weighted order `wp(1,2,0)`, it ''does'' allow to provide the
`dp` order with an additional weight vector, and this weight vector can
contain negative numbers:
{{{
> ring r = 0,(a,b,c),(a(1,-2,0),dp);
> a,b,c; // so, printing in Singular is correct
a b c
> deg(b); // and the given degrees are used
-2
> deg(c);
0
}}}
Couldn't we change the method `TermOrder.singular_str()`, such that
`(a(...),dp)` is used if there is any non-positive weight?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11316#comment:28>
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