#19190: LatticePoset: add atoms, coatoms, doubly irreducibles etc.
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-7.2
Component: combinatorics | Resolution:
Keywords: latticeposet | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jmantysalo/latticeposet__add_atoms__coatoms__doubly_irreducibles_etc_|
429b494b5f553952bf6ed88fe1f1d9dc744d2f15
Dependencies: | Stopgaps:
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Changes (by jmantysalo):
* status: new => needs_review
* commit: => 429b494b5f553952bf6ed88fe1f1d9dc744d2f15
* keywords: poset => latticeposet
* milestone: sage-wishlist => sage-7.2
Old description:
> To a normal user viewpoint:
>
> - Add `atoms()`, `coatoms()`, and `doubly_irreducibles()` to finite
> lattices.
> - Add missing functions, like `breadth()`, to index of functions. (Wait
> #19123 to get into beta.)
>
> Internal changes:
>
> - Put `meet_irreducibles()` and `join_irreducibles()` to
> `hasse_diagram.py`. Add wrappers to `lattices.py`. This can help some
> optimization later.
>
> Other things:
>
> - Check documentation of `breadth()`, stupid way to express
> `BooleanLattice(4)`.
>
> Maybe:
>
> - Think about `is_modular_element()` vs. `is_modular()` with argument.
New description:
Add `atoms()`, `coatoms()`, and `doubly_irreducibles()` to finite
lattices.
--
Comment:
This patch will add three functions. Also this will make `LatticePoset()`
to return the empty lattice; compare to `Poset()`.
----
New commits:
||[http://git.sagemath.org/sage.git/commit/?id=429b494b5f553952bf6ed88fe1f1d9dc744d2f15
429b494]||{{{Add atoms() etc.}}}||
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Ticket URL: <http://trac.sagemath.org/ticket/19190#comment:4>
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