#17121: LatticePoset: Add meet_irreducibles, faster is_distributive
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.4
Component: combinatorics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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Finite lattice posets now has `join_irreducibles()` and
`join_irreducibles_poset()`. Add `meet_irreducibles()` and
`meet_irreducibles_poset()`.
`is_distributive()` is now based on formal definition. It can just check
that lattice is graded and that number of both meet- and join-irreducibles
equals to rank (=height-1) of the lattice.
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Ticket URL: <http://trac.sagemath.org/ticket/17121>
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