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High frequency approximation

The ray theoretic ansatz assumes that $K\approx k=\omega s$, which involves setting the contribution of $\gamma$ and its derivates to zero. Thus, the frequency dependence of the ray path equation is,
\frac{\partial}{\partial \omega}\left(\nabla K\right) = 0,\end{displaymath} (13)
which requires that the ray paths are stationary with respect to frequency.


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