#13997: Fixing a bug in the cyclic sieving phenomenon
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Reporter: stumpc5 | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.7
Component: combinatorics | Resolution:
Keywords: cyclic sieving phenomenon | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Christian Stump | Merged in:
Dependencies: | Stopgaps:
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Changes (by stumpc5):
* status: new => needs_review
Old description:
> This patch fixes a bug in the cyclic sieving phenomenon.
New description:
This patch fixes a bug in the cyclic sieving phenomenon.
Without the patch applied, we have
{{{
sage: from sage.combinat.cyclic_sieving_phenomenon import
CyclicSievingPolynomial
sage: S42 = [ Set(S) for S in subsets([1,2,3,4]) if len(S) == 2 ]; S42
sage: cyc_act = lambda S: Set( i.mod(4)+1 for i in S)
sage: CyclicSievingPolynomial( S42, cyc_act, order=8, get_order=True )
[q^6 + 2*q^4 + q^2 + 2, 4]
}}}
while with the patch applied, you get
{{{
sage: CyclicSievingPolynomial( S42, cyc_act, order=8, get_order=True )
[q^6 + 2*q^4 + q^2 + 2, 8]
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13997#comment:1>
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