#13638: fix adjacency of rays
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Reporter: vbraun | Owner: mhampton
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.5
Component: geometry | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Volker Braun | Merged in:
Dependencies: | Stopgaps:
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Comment (by vbraun):
A ray by itself does not define an edge, so you can't identify these two
concepts. I claim that it does make sense to treat V-representation
objects (vertices, rays, lines) on the same footing when talking about
vertex-adjacencies. To span an edge you need two vertices, a vertex and a
ray, or a vertex and a line.
Alternatively, you can understand this by going to projective space. Now
rays are just points at infinity...
The original error message in the ticket description is a bug in my code
for plotting where I didn't handle some special case with rays correctly.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13638#comment:10>
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