Book excerpt: Formally published for the first time, Professor William R. Sears classic work, "Introduction to Theoretical Aerodynamics and Hydrodynamics, "reflects many years of continual evolution as a course study guide at the Graduate School of Aeronautical Engineering at Cornell University, with updates prepared by his former students to enhance ease of use by todays students. Instructors will find this a superb textbook for a first course in ideal aerodynamics and/or hydrodynamics. Because Sears was a master of connecting mathematical concepts with physical fluid dynamic quantities, readers will find fundamental concepts directly connected to practical applications in the numerous step-by-step examples found throughout the book. SPECIAL FEATURES