#11139: Ideal with no generators for univariate polynomial rings
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Reporter: mraum | Owner: malb
Type: defect | Status: needs_info
Priority: blocker | Milestone: sage-4.7
Component: commutative algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: John Palmieri | Author: Martin Raum, Jeroen
Demeyer
Merged: | Dependencies:
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Changes (by mraum):
* status: needs_review => needs_info
Comment:
I think that indeed the logic is much better. Though it might be confusing
to beginners. But this improvement brings my attention to a problem, that
has been there before:
{{{
R.<x> = QQ[]
R.ideal((x for _ in range(2)))
}}}
This is an instance of GeneratorType, that is called with len. So either
we exclude the GeneratorType (no change to the situtation before) or
correct it. Also, mind that a ring element might be an instance of
GeneratorType. In that (very exceptional) situation, the new logic would
cause trouble.
Any experience with similar code at other places in Sage?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11139#comment:4>
Sage <http://www.sagemath.org>
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