#18613: Errors with is_isomorphic() for trivial cones
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Reporter: mjo | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.8
Component: geometry | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by novoselt):
So the problem is with constructing the cone lattice of a fan containing
the trivial cone only. We probably should call/get
{{{
sage: list(sage.geometry.cone.Hasse_diagram_from_incidences([()], [()]))
[((), (0,)), ((0,), ())]
}}}
for the lattice with a single atom (fan) and single coatom (trivial cone).
We seem to correctly pass the list of coatoms, but have no atoms at all.
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Ticket URL: <http://trac.sagemath.org/ticket/18613#comment:2>
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