摘要
Let V0=diag（d1,…, dN）, V1=((1-δij)uij), where di are the distinct complex constants and the potentials uij=uij（x, t） are taken from the Schwartz space S for the fixed t. Set x0=1, x1=x, and define the matrices Wkα, k=0, 1, 2,…; α=0,1, by W0α=xαV0, W1α=xαV1, aδj0V0-Wjxα+[V0, Wj+1α]+[V1, Wjα]=0, j≥0,
