#19190: LatticePoset: add atoms, coatoms, doubly irreducibles etc.
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: new
Priority: minor | Milestone: sage-wishlist
Component: combinatorics | Resolution:
Keywords: poset | Merged in:
Authors: Jori Mäntysalo | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by jmantysalo:
Old description:
> Add `atoms()`, `coatoms()`, and `doubly_irreducibles()` to
> `LatticePoset`. Add missing functions, like `join_irreducibles()`, to
> index of functions. Do this after #19123 gets positive review and gets
> into beta.
>
> Other things:
>
> - Check documentation of `breadth()`, stupid way to express
> `BooleanLattice(4)`.
New 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.
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Ticket URL: <http://trac.sagemath.org/ticket/19190#comment:2>
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