#8800: Doctest coverage of categories
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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):
The next one:
{{{
sage: F = FreeModule(ZZ,3).construction()[0]
sage: F
VectorFunctor
sage: F.domain()
Category of objects
sage: F.codomain()
Category of objects
sage: Set([1,2,3]) in F.domain()
True
sage: F(Set([1,2,3]))
Traceback (most recent call last):
...
AttributeError: 'Set_object_enumerated' object has no attribute
'is_commutative'
}}}
Since the functor calls the ``FreeModule`` constructor, and since this
constructor expects a commutative ring, the Vector functor should go from
the category of commutative rings to the category of commutative additive
groups (since the category of modules requires naming a base ring).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8800#comment:9>
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