Method of Stationary Phase and Short-wave Asymptotics
The method of stationary phase is one of the simplest methods for finding asymptotics of integrals, and yet it leads already to important results in the theory of hyperbolic equations and in various asymptotic problems for elliptic equations. With this method is closely associated the classical WKB method, so called in honour of the physicists Wentzel, Kramers and Brillouin who were the first to apply this method to the problems of quantum mechanics. The development of the WKB method leads to significant analytic and geometrical constructions, and one of the most important among these is the Maslov canonical operator which enables us to solve a large class of asymptotic problems.
KeywordsCauchy Problem Asymptotic Solution Phase Function Hyperbolic Equation Modern Theory
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