#19383: Up-down Posets, and Dimenson Poset
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Reporter: kdilks | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.10
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Changes (by jmantysalo):
* milestone: sage-6.9 => sage-6.10
Comment:
From another ticket: "Maybe implement up-down posets generally, and then
have `zigzag_poset(n)` as an alias for `updown_poset(1,n)` ? Zig-zag poset
is something that people might be interested in without necessarily
knowing the generalized notion of up-down posets."
At least the docstring must mention "zigzag" and "fence" so that they will
be found by search. (Compare to my addition about "weak order" etc. to
`is_incomparable_chain_free`.
Also nothing prevents the index to have
{{{
UpdownPoset - The poset...
PentagonPoset - 5-element poset...
Zigzag - see (link)UpdownPoset(/link)
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/19383#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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