#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 | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by jmantysalo):
Actually this happens with just posets:
{{{
P = Poset({0:[1]})
R = Poset(P, facade=False)
P._hasse_diagram is R._hasse_diagram
}}}
also outputs `False`. I can see no reason for this either. And still more,
what about
{{{
P = Poset({0:[1]})
Q = P.relabel(lambda i: chr(ord('a')+i))
P._hasse_diagram is Q._hasse_diagram
}}}
? Relabeling does not touch the underlying digraph of plain `int`s.
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Ticket URL: <http://trac.sagemath.org/ticket/18776#comment:2>
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