#19473: FiniteDimensionalAlgebra.is_unitary is not sufficient
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Reporter: darij | Owner:
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.10
Component: algebra | Resolution:
Keywords: finite- | Merged in:
dimensional algebra, linear | Reviewers: Travis Scrimshaw
algebra | Work issues: clear up
Authors: Darij Grinberg, | associativity requirement; if
Travis Scrimshaw | necessary, change superclass and
Report Upstream: N/A | is_unitary method
Branch: | Commit:
public/algebra/finite_dim_algebra_fixes-19473|
0cfe0366fc527d2f692c835be3d40f60aa61c471
Dependencies: | Stopgaps:
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Comment (by pbruin):
Replying to [comment:5 tscrim]:
> I would get rid of the `copy` attribute, instead make this a
`UniqueRepresentation` (or perhaps a `UniqueFactory` so we can better
control the cache key), and make the table a tuple of immutable matrices
that gets set by the `__classcall_private__`.
How does introducing `UniqueRepresentation` help in solving this ticket?
Wouldn't it be better to do that on a separate ticket?
> We also need to fix the category, which is wrong for non-associative,
non-unital cases.
I agree. It is unfortunate that refining the category after
initialisation is possibly problematic.
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Ticket URL: <http://trac.sagemath.org/ticket/19473#comment:13>
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