Abstract
The author reports a gradient formula for the group U(2l+1). It is derived in the special case of U(5) and then extended to U(2l+1). The matrix elements of a homogeneous polynomial Pv( pi 2) of degree v in the collective momenta pi 2m is given in terms of the matrix elements of the same polynomial Pv( alpha 2) depending only on the collective coordinates alpha 2m.