#11068: Basic implementation of one- and twosided ideals of non-commutative
rings,
and quotients by twosided ideals
---------------------------+------------------------------------------------
Reporter: SimonKing | Owner: AlexGhitza
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.2
Component: algebra | Keywords: onesided twosided ideal
noncommutative ring sd32
Work_issues: | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #10961, #9138, #11115, #11342
---------------------------+------------------------------------------------
Comment(by john_perry):
> Could you please state precisely what you did?
Sure.
{{{
sage: MS = MatrixSpace(GF(5),2,2)
sage: I = MS*[MS.0*MS.1,MS.2+MS.3]*MS
sage: Q = MS.quo(I)
sage: x = Q.an_element()
sage: y = MS.1
sage: x in Q, y in Q
(True, True)
sage: x*y
}}}
...and we get the error generated above.
Apparently this was '''not''' a problem with `x=MS.1`; I seem to have
mistyped `x==MS.1` when I was testing that.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11068#comment:33>
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