theorem of the three geodesics造句

They also proved the theorem of the three geodesics, that a Riemannian manifold topologically equivalent to a sphere has at least three simple closed geodesics.
Another result of Pogorelov on the geodesic metric spaces derived from convex polyhedra is a version of the theorem of the three geodesics : every convex polyhedron has three simple closed quasigeodesics.
It's difficult to find theorem of the three geodesics in a sentence. 用theorem of the three geodesics造句挺难的