<span>In this paper we shall discuss the construction of formal short-wave asympยญ totic solutions of problems of mathematical physics. The topic is very broad. It can somewhat conveniently be divided into three parts: 1. Finding the short-wave asymptotics of a rather narrow class of problems, which
Partial Differential Equations III: The Cauchy Problem. Qualitative Theory of Partial Differential Equations (Encyclopaedia of Mathematical Sciences)
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