#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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Description changed by darij:
Old description:
> Being a ribbon means not just containing no 2x2 squares; it also means
> being connected.
>
> {{{
> sage: SkewPartition([[3,1],[2]])
> [3, 1] / [2]
> sage: _.is_ribbon()
> True
> }}}
New description:
Being a ribbon means not just containing no 2x2 squares; it also means
being connected.
{{{
sage: SkewPartition([[3,1],[2]])
[3, 1] / [2]
sage: _.is_ribbon()
True
}}}
Good news is that these methods seem to never be used.
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Ticket URL: <http://trac.sagemath.org/ticket/18014#comment:1>
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