2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106035Closed geodesic lines on an ellipsoid in d-dimensional Euclidean space are considered. Explicit algebro-geometric condition for closedness of such a geodesic is given. The obtained condition is discussed in light of theta-functions theory and compared with some recent related results.9 pagesMathematical PhysicsAlgebraic Geometry14H70; 51N35; 70H06text