# Translations:The eikonal equation - book/8/en

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Eikonal equation **15** says that the magnitude of the gradient of the traveltime is equal to the slowness (Robinson and Clark, 2003^{[1]}).

- ↑ Robinson, E. A., and R. D. Clark, 2003, The eikonal equation and the secret Pythagorean theorem: The Leading Edge,
**22**, no. 8, 749–750.