#18776: From poset to lattice: Do not copy Hasse Diagram
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Reporter: jmantysalo | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-wishlist
Component: combinatorics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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{{{
P = Poset({0:[1]})
Q = Poset(P)
L = LatticePoset(P)
P._hasse_diagram is Q._hasse_diagram, P._hasse_diagram is L._hasse_diagram
}}}
outputs `(True, False)`. Hence Hasse diagram, which is immutable, is
copied --- and so also meet and join matrix will be computed twise.
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Ticket URL: <http://trac.sagemath.org/ticket/18776>
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