Polyhedron and Polytope (=compact Polyhedron) implies convex. For example: sage: lp = LatticePolytope(matrix([[-1,-1], [-1,0], [0,0], [1,0], [1,-1]]).transpose()) sage: lp.points() [-1 -1 1 1 0 0] [-1 0 0 -1 -1 0] sage: lp.vertices() [-1 -1 1 1] [-1 0 0 -1]
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