An Introduction to Phase-Integral Methods either with or without a

either with or without a teacher

untried substances

books on inquiries

political movements

She stands alone against the villains who rustle and stampede her cattle — until a stranger rides into the territory

An Introduction to Phase-Integral Methods either with or without aThe phase integral method in mathematics, also known as the Wentzel Kramers Brillouin (WKB) 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 in mathematics and physics. Since the number of applications is vast, the text considers only a brief selection of topics and emphasizes