Eikonal

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Eikonal is the German form of the Greek word εἰκών, meaning likeness, icon or image. It can refer to:

  • Eikonal equation, a non-linear partial differential equation encountered in problems of wave propagation.
  • Eikonal approximation, a method of approximation useful in wave scattering equations.
  • Operation Eikonal, an operation conducted by the National Security Agency in collaboration with the Bundesnachrichtendienst.

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