#15150: Implement NCSym
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Reporter: tscrim | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.12
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Travis Scrimshaw | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: #15143 | Stopgaps:
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Comment (by darij):
Oh, that's ugly (although I hope you mean {{{SetPartitions(4, [2,1,1])}}}.
I'm wondering if we need a parent for set partitions with given type at
all? I can think of very few maps which preserve the type, and it's not
just inf and sup that fail:
{{{
sage: P = SetPartitions(4, [2,1,1])
sage: x = P[0]
sage: x.coarsenings()
[...]
AssertionError:
sage: x.refinements()
[...]
AssertionError:
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/15150#comment:31>
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