#14862: Compositions accept any input
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Reporter: stumpc5 | Owner: sage-combinat
Type: defect | Status: needs_work
Priority: major | Milestone: sage-5.13
Component: combinatorics | Resolution:
Keywords: composition, | Merged in:
FindStat | Reviewers:
Authors: | Work issues: provide a test in the
Report Upstream: N/A | constructor
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by darij):
Ouch! Thanks for finding these things. The very idea that weights of
tableaux should be compositions isn't particularly literate (and it seems
to account for most of the failures). I see two ways to fix this:
* Add a `WeakCompositions` class that checks for nonnegativity (rather
than positivity) and only removes trailing zeroes on uniformization. (A
weak composition is a finitely supported infinite sequence of nonnegative
integers.)
* Let the weight just be an iterable, with checks being done in
`__classcall__`
I'd much prefer to have this decided before the tableau rewrite...
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Ticket URL: <http://trac.sagemath.org/ticket/14862#comment:25>
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