#8649: to_tableau method broken for crystals of type B
------------------------------+---------------------------------------------
Reporter: aschilling | Owner: sage-combinat
Type: defect | Status: positive_review
Priority: major | Milestone: sage-4.4
Component: combinatorics | Keywords: crystals
Author: Anne Schilling | Upstream: N/A
Reviewer: Dan Bump | Merged:
Work_issues: |
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Comment(by nthiery):
Replying to [comment:8 bump]:
> The tableaux method does work with Sage for G2. This *may* be an
accident
> in that this would not be a good approach for other exceptional groups.
Or
> maybe not. Anyway we have a crystal of letters for G2 and it has a 0.
And after the
> patch, crystals of tableaux for G2 produce correct tableaux output.
>
> I tend to think this is *not* an accident and take it as evidence that 0
is
> really special. I guess the case where things might break in a worse way
is F4.
That's an interesting point!
> > If we are sure that no crystal of letter (or more generally crystal
that we want to use as letter in a tableau) will ever have a letter called
0, except for type B, or if we are willing to take the risk, then I guess
we can be lazy, and just leave things as they are.
>
> I think the positive review should stand. It's not just a matter of
laziness, unless
> we have an alternative approach.
I still think it is laziness until we have a proof that 0 is special in
all types. But I agree that the positive review should stand.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8649#comment:9>
Sage <http://www.sagemath.org>
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