#11900: Serious regression caused by #9138
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Reporter: SimonKing | Owner: tbd
Type: defect | Status: needs_work
Priority: blocker | Milestone: sage-4.7.2
Component: performance | Keywords: categories regression
Work_issues: | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #9138
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Comment(by SimonKing):
Replying to [comment:32 nthiery]:
> Altogether your proposals look very good. I am just unsure about short
> circuiting "Category.join", but I would need to look more in
> detail.
Which of the two work-arounds do you mean? The caching (so that the cache
already happens when calling `Category.join(L)`, not only when creating
the `JoinCategory`)? Or the attempt to directly create the `JoinCategory`
during creation of a polynomial ring?
I think the latter is justified by having only few cases: It can be
`UniqueFactorisationDomain`, `IntegralDomain` or `EuclideanDomain`, and it
can be commutative or not. So, one can directly write down the result,
rather than calling the `Category.join(...)` mechanism. Of course, one
needs to verify that I wrote it down correctly.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11900#comment:33>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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