#13240: Give posets polynomials (order, characteristic, zeta, etc.)
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Reporter: csar | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: combinatorics | Resolution:
Keywords: sd40, days45 | Merged in:
Authors: Alex Csar, Kevin Dilks | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by darij):
Hi Frederic,
I've completed my review, editing again all four f/h-polynomials (flag and
usual). Please check that:
1) the definitions I've added to the docstring are correct (I have deduced
them from the implementation, except for the size-1 poset case which I
just found had to give 1 for reasons of consistency);
2) all four methods return what they should in the case of a poset with 1
vertex (this is doctested, but I don't know if it's what you want);
3) you really want the flag h-polynomial to be returned as a polynomial
over QQ, even if it has integer coefficients.
If these are fine, feel free to set this to positive review!
--
Ticket URL: <http://trac.sagemath.org/ticket/13240#comment:36>
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