#20940: LatticePoset: add is_sectionally_complemented()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-7.3
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/sectionally_complemented|
abfcae83def761c57b61313335c0ce0ded864457
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:14 kdilks]:
> I guess I misunderstood what was being said about the certificate being
a tuple. My presumption was that the function would always return
{{{True}}} if true, but would either return {{{False}}} or a tuple with
all possibly relevant data if false depending on {{{certificate}}}. Isn't
that how other certificates in Sage work?
It depends. Certificate for dimension of a poset is a list on linear
extensions and for breadth of a lattice a list of elements.
For `is_dismantlable` there is both positive and negative certificate: a
dismantling order or a crown subposet.
But I think there are also functions so that they always return a tuple
whose first element is a Boolean value.
--
Ticket URL: <https://trac.sagemath.org/ticket/20940#comment:15>
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