#19141: Poset documentation polishing: Boolean-valued properties
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-6.10
Component: combinatorics | Resolution:
Keywords: poset | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/poset_documentation_polishing__boolean_valued_properties|
39d1e185906821d6fcece65560e1081eb11e1493
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:16 kdilks]:
> Why not just have one function called {{{is_chain()}}} that does what
{{{is_chain_of_poset()}}} currently does? If you want to want to find out
if you entire poset is a chain, you can run {{{is_chain(P.elements())}}} .
Or even {{{is_isomorphic(Posets.ChainPoset(len(P.elements()))}}}. There
aren't special aliases for determining isomorphism type with any other
family of posets.
I have used `is_chain` to find some interesting examples, i.e. to filter
out uninteresting cases. Fortunately `is_chain` does not take arguments,
and `is_chain_of_poset` has a mandatory argument. Hence the error will be
easily seen.
I guess there could also be `is_antichain()`, as it can too be useful as
filter-out -function.
(And I would not mind having something like `describe`, like in small
group id database has for groups. It could output something like "Vertical
decomposition of Boolean lattice 3 and Tamari lattice 4." But might not be
that easy to make it...)
--
Ticket URL: <http://trac.sagemath.org/ticket/19141#comment:18>
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