#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 dimpase):
Replying to [comment:8 vbraun]:
> Yes, I was thinking about more than one vertex (and thats what the
doctest is doing). I've fixed the wording and the typo.
>
> I was taking polygons as an example, since its easier to visualize. In
higher dimension there is of course no cyclic ordering of adjacent
vertices. Apart from that it works the same.
In fact, now I think the setup is mathematically not quite sound. Sorry
for not noticing this straight away.
In my book, rays and edges are of the same dimension. One cannot normally
even talk about adjacency between rays and vertices, yet you do (lines
974-9 of {{{geometry/polyhedron/base.py}}}).
Although you can certainly talk about incidence between them, by
inclusion, as usual.
You can have adjacency graphs between faces of the same dimension (bounded
or not, does not matter).
It would simplify things if one knows what exactly is behind the error
message in the description.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13638#comment:9>
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