a) From the vorticity equation, we understand that vorticity generation must be a 3D process. When studying the laminar boundary layer (Blasius solution), we carry out a 2D analysis. In this case, how can the vorticity be generated? 

b) Reformate the steady boundary layer over a flat plate problem with non-zero free-stream pressure gradient using the stream function-vorticity formulation (8 pts). Please also specify the boundary conditions for this problem (10 pts).