The generators constructed for the Yangian are shown to obey the Drinfel'd formula and, furthermore, the RTT relation for the general form of a rational R-matrix is given by the Yang-Baxterization associated with the so(6) algebraic structure. Moreover the simplified relations of Y(so(6)) can be extended to Y(so(N)). The nonlinear Schrödinger model with four-component fermions possesses a Y(so(6)) symmetry when considered on an infinite interval.
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