The paper clarifies the sign of singular curvature at cuspidal edges on focal surfaces by analyzing singularities of parallel surfaces of a given regular surface under certain conditions.
Teramoto, Geometric properties of caustics of pseudo-spherical surfaces, to appear in Rend
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Cuspidal edges on focal surfaces of regular surfaces
The paper clarifies the sign of singular curvature at cuspidal edges on focal surfaces by analyzing singularities of parallel surfaces of a given regular surface under certain conditions.