#11900: Serious regression caused by #9138
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Reporter: SimonKing | Owner: tbd
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.7.3
Component: performance | Keywords: categories regression
Work_issues: fix doctests | Upstream: N/A
Reviewer: | Author: Simon King
Merged: | Dependencies: #9138 #11911
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Comment(by SimonKing):
Replying to [comment:57 nthiery]:
> Replying to [comment:56 SimonKing]:
> Roughly speaking yes; in any cases, that's currently true AFAIK.
No it isn't. That's why I asked:
{{{
sage: M = ModulesWithBasis(QQ)
sage: M.base()
Rational Field
sage: P = M.CartesianProducts()
sage: hasattr(P,'base')
False
sage: P.is_subcategory(M)
True
}}}
Thus, P has no base, but is a sub-category of a category with base.
> However, we might want to someday model the fact that any ring is a ZZ-
module (or maybe not).
That would probably just mean that the category of rings gets a base as
well, namely ZZ.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11900#comment:58>
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