#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 polyhedron has at least one vertex, except when it is empty:
{{{
sage: Polyhedron(lines=[(1,0),(0,1)])
A 2-dimensional polyhedron in QQ^2 defined as the convex hull of 1 vertex
and 2 lines
sage: _.Vrepresentation()
(A line in the direction (0, 1), A line in the direction (1, 0), A vertex
at (0, 0))
sage: Polyhedron()
The empty polyhedron in QQ^0
sage: _.Vrepresentation()
()
}}}
The representation of polyhedra containing whole lines is not unique.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13638#comment:14>
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