An Introduction to Phase-Integral Methods

The phase-integral method in mathematics, also known as the Wentzel-Kramers-Brillouin (WBK) method, is the focus of this introductory treatment. Author John Heading successfully steers a course between simplistic and rigorous approaches to provide a concise overview for advanced undergraduates and graduate students. Topics include the Stokes phenomenon, one and two transition points, and applications. 1962 edition.