jacobian  the Jacobian matrix of partial derivatives
See also

diff  differentiate or take difference

contract  contract one matrix by another
Ways to use jacobian:

jacobian(Ideal)  the Jacobian matrix of the generators of an ideal

jacobian(Matrix)  the matrix of partial derivatives of polynomials in a matrix

jacobian(Ring)  the Jacobian matrix of the polynomials defining a quotient ring

jacobian(RingElement) (missing documentation)