#13240: Give posets polynomials (order, characteristic, zeta, etc.)
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Reporter: csar | Owner: sage-combinat
Type: enhancement | Status: new
Priority: major | Milestone: sage-5.10
Component: combinatorics | Resolution:
Keywords: sd40, days45 | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Alex Csar, Kevin Dilks | Merged in:
Dependencies: | Stopgaps:
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Comment (by csar):
Okay, I've added the chain polynomial and the order polynomial. We had
something written for the antichain polynomial, but I didn't include it as
I wanted to check with Kevin if he knew a better way of doing it like he
worked out for the chain polynomial.
The chain polynomial is written so you can ask for it in terms of
something other than q. So, for example, `P.chain_polynomial(1)` would
give you the chain polynomial evaluated at one. Obviously, things should
be consistent as to whether you get to choose the variable, but it's a
minor change to go either direction.
I made a second patch on top of yours because I wasn't sure if I should be
making a separate one or just adding to the patch, and combining them
shouldn't be hard.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13240#comment:12>
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