... Sails and Klein Polyhedra . October 24, 2003 . ... Arnold's problem on hyperbolic hypersurfaces in projective spaces . ... E.Vinberg (MSU) . Radon transform of symmetric spaces. January 11, 2001 . ...
... considered by Klein and studied by Arnold. if C is a simplicial cone in the euclidean space of dimension d, the Klein polyhedron of C is the convex hull of the integer points contained in C, and the sail V of C is the boundary of the Klein polyhedron ...