Euclidean space

euclidean plane manifold riemann sphere three dimensional handlebody convex combination glome de sitter space hyperboloid wick rotation parallel gyroparallelogram affine combination standard topology k cell nonmanifold hypersurface two dimensional anti de sitter space n space line atlas inner product centerpoint regular grid metric heine borel theorem vector field flat lebesgue measurable real vector space lebesgue measure cartesian space euclidean norm gauss map riemann space compact space sphere polytope polyhedron