The nonlinear boundary value
problem Lu + Nu = 0 is considered, where L is the biharmonic operator and N is a
nonlinear monotone operator. By factoring the operator L as TT∗, where T is the
maximal operator associated with the Laplacian, the theory of monotone operators is
utilized to obtain an existence and uniqueness theorem for the operator
equation. SeveraI examples are given to illustrate the applicability of the
resu1t.