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The Complex WKB Method for Nonlinear Equations I

Linear Theory

Such solutions are almost everywhere well approximated by the functions p(x)
exp{i5(x)//i}, x C R3, where S(x) is complex, and ImS(x) ^ 0. When the phase S(x)
is real (ImS(x) = 0), the method for obtaining asymp- totics of this type is known in
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