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Trac #17215: Normal cone of faces of polyhedra
A point v on a convex polyhedron P is a vertex of P if and only if there exists an affine hyperplane in the linear span of P which intersects P only in v. Knowing such affine hyperplane is a good certificate for v being a vertex. This ticket implements the method `normal_cone` for faces of polyhedra, consisting of all the directions of the normals to supporting hyperplanes of the specified face. URL: https://trac.sagemath.org/17215 Reported by: darij Ticket author(s): Jean-Philippe Labbé Reviewer(s): Jonathan Kliem
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