#13225: Check if lattices are upper/lower-semimodular and modular
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Reporter: csar | Owner:
sage-combinat
Type: enhancement | Status:
needs_review
Priority: major | Milestone:
sage-5.6
Component: combinatorics | Resolution:
Keywords: sd40 | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Alex Csar, Kevin Dilks, Sangwook Kim | Merged in:
Dependencies: | Stopgaps:
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Description changed by csar:
Old description:
> Add is_upper_semimodular, is_lower_semimodular and is_modular to
> FiniteLatticePoset class.
>
> Will also fix a bug in meets/joins of dual lattices that we came across.
New description:
Add is_upper_semimodular, is_lower_semimodular and is_modular to
FiniteLatticePoset class.
Changes _meet and _join in the HasseDiagram class to lazy attributes,
fixing the problem that meets and joins failed to be defined for the dual
of a lattice.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13225#comment:7>
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