#19191: LatticePoset: add is_planar()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/latticeposet__add_is_planar__|
c669ecbf2476518175f0719ba25e76cdc05f1521
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:17 ncohen]:
>Even the paper that mentions this additional edge between 0 and n-1 uses
*this* definition (without the additional edge) and apparently proves that
you can add this edge without changing the property.
No. Hasse diagram for `BooleanLattice(3)` is planar, but it has no upward
planar drawing.
> If you want to implement another definition, it will have to be under
another name.
That's OK.
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Ticket URL: <http://trac.sagemath.org/ticket/19191#comment:18>
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