#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|
23c3ee3f5b23192f2d60f2979865d4baf14f60ca
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:3 kdilks]:
> Would it be of any value to have an optional {{{certificate}}} parameter
which would return the poset element whose principal order ideal isn't
complemented instead of just {{{False}}}?
As you wish.
But now for orthogonality we should add `certificate`s to other functions
too. Which is not a bad idea at all, at least for demonstration purposes
(really show the pentagon for non-modular lattice etc.). I could start
with `complements()`, but then someone should first review #20727 that
corrects a trivial bug.
--
Ticket URL: <https://trac.sagemath.org/ticket/20940#comment:5>
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