Determine the Cartesian stresses and displacements in a rectangular domain (–a≤ x≤ a; – b≤y≤ b) from the potentials γ (z) = Aiz²,Ψ(z) =–Aiz², where A is an arbitrary constant. Discuss the boundary values of these stresses, and show that this particular case could be used to solve a pure bending problem.