#18762: Create coercion between diagram algebras and the symmetric group algebra
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Reporter: ghseeli | Owner:
Type: enhancement | Status: needs_work
Priority: minor | Milestone: sage-6.9
Component: algebra | Resolution:
Keywords: diagram algebra, | Merged in:
partition algebra, days65 | Reviewers:
Authors: George H. | Work issues:
Seelinger | Commit:
Report Upstream: N/A | ea857ff335ac439123ef7b7891bdd8909e5c3fb4
Branch: | Stopgaps:
u/ghseeli/create_coercion_between_diagram_algebras_and_the_symmetric_group_algebra|
Dependencies: #18720 |
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Comment (by tscrim):
My guess is that we have the coercion situation `BA -> X -> A` where `X`
is some intermediate object that makes the coercion chain. At some point
in the doctests:
1 - `BA` and `A` have been created, but `X` has not.
2 - There is a check in some way for if there is a coercion from `BA` to
`A`, which there is not. (This can be something as innocuous as `A(x)`
where `x in BA`).
3 - The result of 2 is cached, so even when `X` is created, there is no
check to see if there is a coercion path from `BA` to `A`.
However that is just a quick guess from the symptoms. I will take a more
detailed look over the next few days.
Side note in case you didn't notice, you have `TESTS:` block which should
be `TESTS::`.
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Ticket URL: <http://trac.sagemath.org/ticket/18762#comment:24>
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