#16443: Category Modules ~> Algebras
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Reporter: elixyre | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.3
Component: categories | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Strange problem:
{{{
from sage.categories.category_types import Category_over_base_ring
class A(Category_over_base_ring):
def super_categories(self):
R = self.base_ring()
return [Algebras(R]
#return [Modules(R)]
class B(UniqueRepresentation, Parent):
def __init__(self, R):
Parent.__init__(self, category=A(R))
}}}
That fails! (6.2 rc 2):
{{{
sage: B(QQ)
...
TypeError: None is not in Category of rings
}}}
But if I try to change the super categories:
{{{
Algebras(R) --> Modules(R)
}}}
That works! What's error mean?
--
Ticket URL: <http://trac.sagemath.org/ticket/16443>
Sage <http://www.sagemath.org>
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