#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:29 ncohen]:
> > 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`.
>
> Right, right. And returning `True` is precisely what your branch does:
True. Hence my branch needs correcting.
I think that this relates also with `sublattice()` and
`random_maximal_sublattice()` (see #18562). Should there be "public"
functions on `lattices.py` returning lists? This would be kind of
optimization for some computations. Other way is to have them on
`hasse_diagram.py`, so that advanced user might use them directly.
--
Ticket URL: <http://trac.sagemath.org/ticket/18511#comment:30>
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