#18511: LatticePoset: add is_sublattice()
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-wishlist
Component: combinatorics | Resolution:
Keywords: | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/latticeposet__add_is_sublattice__|
c3e1c19e4e7c8c1a666a755c96bb5a23ea921b1a
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Replying to [comment:3 ncohen]:
> the way it is implemented, your function works for both. And I do not
personally mind if `is_sublattice` also works on lists.
OK. How about the name of the function?
> On the other hand, with the current implementation the antichain on 5
elements is a sublattice of the chain on 5 elements.
??
{{{
sage: L=Posets.ChainPoset(5)
sage: M=Posets.AntichainPoset(5)
sage: L.is_sublattice(M)
False
}}}
Replying to [comment:6 ncohen]:
> I mean the `hasse_diagram.is_sublattice` which is called by
`Lattice.is_sublattice` but does not check that 'other' is a subposet of
self.
But that is checked on `lattices.py`. Isn't it slower to access elements
of _hasse_diagram on a loop from another file?
--
Ticket URL: <http://trac.sagemath.org/ticket/18511#comment:7>
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