The book opens with a discussion of the vorticity-dynamic formulation of the low Mach number viscous flow problem. Physical aspects of the velocity and the vorticity fields, their instantaneous relationship, and the transport of vorticity in viscous fluids are examined for steady and unsteady flows. Subsequently, the mathematical aspects of vorticity dynamics and issues of initial and boundary conditions for the viscous flow problem are treated rigorously using classical analyses. Coverage includes evolution of the vorticity field which surrounds and trails behind airfoils and wings,...