#18511: LatticePoset: add is_sublattice()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.9
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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Changes (by jmantysalo):
* status: needs_review => needs_work
* milestone: sage-6.8 => sage-6.9
Old description:
> Add function to check if a given iterable (like another lattice or poset,
> or just a list of elements) is a sublattice of the lattice. There should
> be nothing complicated with this.
New description:
Add function to check if a given lattice is a sublattice of the lattice.
There should be nothing complicated with this.
--
Comment:
Returning to this one... We have `is_subgraph` and there is `is_subposet`
on #15875 waiting for review. So I guess this should be also
`is_sublattice()`.
On the other hand, then testing if a list `l` of elements of `L` is closed
under meet and join must be done like
`LatticePoset(L.subposet(l)).is_sublattice(L)`. But maybe we can live with
it.
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Ticket URL: <http://trac.sagemath.org/ticket/18511#comment:31>
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