. . . . . . . . . . "3022"^^ . . . "44921963"^^ . . . "In the math branches of differential geometry and vector calculus, the second covariant derivative, or the second order covariant derivative, of a vector field is the derivative of its derivative with respect to another two tangent vector fields."@en . . . . . . . . "1099201148"^^ . . . . "In the math branches of differential geometry and vector calculus, the second covariant derivative, or the second order covariant derivative, of a vector field is the derivative of its derivative with respect to another two tangent vector fields."@en . . "Second covariant derivative"@en . . . . . .