Construction of the solutions of boundary value problems for the biharmonic operator in a rectangle
A technique is developed for constructing the solution of in , subject to boundary conditions , on . The problem is reduced to that of finding the orthogonal projection of in onto the subspace of square integrable functions harmonic in . This problem is solved by decomposition into the closed direct (not orthogonal) sum of two subspaces for which complete orthogonal bases are known. is expressed in terms of the projections , of onto , respectively. The resulting construction...