Mechanical engineers tend to be very selective as to the areas of their investigations. They tend to study the basic areas of structures, heat transfer, and fluid flow. Their applications within these areas tend to follow the lines of traditional problems that engineers and physicists are most likely to encounter in industry. Structural engineers, for example, tend to study deformation, materials, and fracture mechanics. There are many unsolved problems in these areas that would enjoy the applications of the methods within this textbook.