#19191: LatticePoset: add is_planar()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_info
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__|
da6a1f9536ac362eef45f565515c752afdf9c84f
Dependencies: #19193 | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:27 ncohen]:
> I still hesitate over this `is_planar` and `is_upward_planar`. If you
really think that the first is better then let's do this, but if you
believe that anybody who looks for `is_planar` would also think of trying
`is_upward_planar` then the second is obviously safer. Tell me how you
want it done, and I will update the branch accordingly.
Googling "upward planar lattice" seems to found nothing. I guess it is
good reason to have `is_planar()`, as it seems to be only used term.
(In the future we should not have problems like this. Just wait until
SageMath is The Software and all questions about "what is exact definition
of...?" will be answered "Sage defines...". `;=)`)
--
Ticket URL: <http://trac.sagemath.org/ticket/19191#comment:28>
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