#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):
"Also I found a bug with the expansion, in that SetPartition was not
always living in the correct parent when taking inf or sup."
How that?
{{{
sage: P = SetPartition([[3,1],[2]])
sage: parent(P)
Set partitions
sage: Q = SetPartition([[1,2],[3]])
sage: Q.inf(P)
{{1}, {2}, {3}}
sage: parent(Q.inf(P))
Set partitions
sage: parent(Q.sup(P))
Set partitions
sage: P = SetPartitions(3)(P)
sage: P
{{1, 3}, {2}}
sage: parent(P)
Set partitions of {1, 2, 3}
sage: Q = SetPartitions(3)(Q)
sage: parent(Q)
Set partitions of {1, 2, 3}
sage: P.inf(Q)
{{1}, {2}, {3}}
sage: parent(P.inf(Q))
Set partitions of {1, 2, 3}
sage: parent(P.sup(Q))
Set partitions of {1, 2, 3}
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/15150#comment:29>
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