and imaginary parts, respectively, of If a is a simple zero of f then locally f looks like . Solutions will locally behave like the Airy functions; they will have three Stokes lines and three anti-Stokes lines meeting at a. See also Borel summation References Ablowitz, M. J., & Fokas, A. S. (2003). Complex variables: introduction and applications. Cambridge University Press. Asymptotic analysis Complex analysis