Abstract
An eroding or growing solid surface is treated as an advancing nonlinear wavefront and characteristic methods are used to describe its progress, when the normal velocity of erosion is a well-defined function of spatial position, and time and surface orientation. Facets, points and edges can develop as the surface evolves and the formation of these are described in terms of the theory. Some interesting examples are computed that have important application in microfabrication, surface analysis and ion beam processing.
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