#18014: is_ribbon on skew tableaux and skew partitions don't really check for
ribbonness
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Reporter: darij | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.6
Component: combinatorics | Resolution:
Keywords: ribbon, partition, skew | Merged in:
partition, tableau, sage-combinat, days64 | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by darij):
OK, the method *is* used, in the `to_ribbon` method. That's a method which
takes a skew tableau, checks if it is ribbon-shaped (incorrectly), and if
so, transforms it into a `RibbonShapedTableau`, which is a class in
`sage/combinat/ribbon_shaped_tableau.py`.
We can fix this, of course. But I am wondering if we really need
`sage/combinat/ribbon_shaped_tableau.py`. There is very little
functionality in that file, and apart from the iterator for standard
ribbon shaped tableaux (which is easy -- they corresponds to permutations
in a given descent class), it can be easily reimplemented in the general
tableaux class. I don't think `sage/combinat/ribbon_shaped_tableau.py` is
used anywhere...
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Ticket URL: <http://trac.sagemath.org/ticket/18014#comment:3>
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