#8800: Doctest coverage of categories
--------------------------+-------------------------------------------------
Reporter: SimonKing | Owner: Simon King
Type: defect | Status: new
Priority: major | Milestone: sage-4.4.2
Component: categories | Keywords: categories doctests
Author: Simon King | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by SimonKing):
Another bug that I plan to remove:
{{{
sage: F = MatrixSpace(ZZ,2,3).construction()[0]
sage: F(RR) in F.codomain()
False
}}}
The problem is that the codomain of ``F`` is supposed to be the category
of rings, even for non-square matrices. I'll change it to the following:
{{{
sage: MatrixSpace(ZZ,2,3).construction()[0].codomain()
Category of commutative additive groups
sage: MatrixSpace(ZZ,2,2).construction()[0].codomain()
Category of rings
}}}
I'd actually like to have the category of modules (rather than of additive
groups), but this would require a ring over which the module is defined
(and which the functor obviously can't know).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8800#comment:8>
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