Seifert Conjecture: Mathematics, Vector Field, 3 Sphere, Herbert

Kepler Conjecture: Johannes Kepler, Mathematics, Conjecture, Sphere packing, Euclidean space, Sphere, Density,...

Seifert Fiber Space: 3 Manifold, Circle Bundle, Orbifold, Geometrization Conjecture

Calabi Conjecture: Mathematics, Conjecture, Complex Manifold

Variational Vector Field: Calculus of Variations, Mathematics