#18511: LatticePoset: add has_sublattice()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.8
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers: Nathann Cohen, Darij
Report Upstream: N/A | Grinberg
Branch: | Work issues:
public/ticket/18511 | Commit:
Dependencies: | 0ef0050b3b959c2115dc9a433d80c62dda905f8f
| Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:27 ncohen]:
> That's an inconsistency between graphs and posets
Duh.
> Well, a `Lattice` is an iterable container of vertices, isn't it? And
you just can't have a `.has_sublattice(X)` function that does not accept a
lattice as input `O_o`
But it would mean that after `L1=LatticePoset({1:[2]}); L2=L2.dual()` we
would have `L2` ''not'' a subposet of L1 but `L1.has_sublattice(L2)` would
return `True`.
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Ticket URL: <http://trac.sagemath.org/ticket/18511#comment:28>
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