#11068: Basic implementation of one- and twosided ideals of non-commutative
rings,
and quotients by twosided ideals
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Reporter: SimonKing | Owner:
AlexGhitza
Type: enhancement | Status:
needs_work
Priority: major | Milestone:
sage-4.7
Component: algebra | Keywords:
onesided twosided ideal noncommutative ring
Author: | Upstream:
N/A
Reviewer: | Merged:
Work_issues: Add examples; move code from ring.py to rings.py |
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Comment(by SimonKing):
Replying to [comment:3 SimonKing]:
> ...
> I think I would be able to add this example as doc test tomorrow, also
removing the whole ideal and quotient stuff from `sage.rings.ring.Ring` to
`sage.categories.rings.Rings.ParentMethods`.
Apparently it took a lot longer. The problem is "moving the whole ideal
and quotient stuff from `sage.rings.ring.Ring` to
`sage.categories.rings.Rings.ParentMethods`. Namely, that involves a
couple of methods with cached output (the cache being hand-written). One
could use the @cached_method decorator in the parent methods -- but the
problem is that the cache breaks when one has a ring that does not allow
attribute assignment.
That problem is solved at #11115. Moreover, @cached_method is now
''faster'' than a hand-written cache in Python. However, it is slower than
a hand-written cache in Cython.
So, the question is: Can we accept the slow-down that would result from
moving code from the ring class to the ring category? Or is it easier to
accept some duplication of code?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11068#comment:5>
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