Singular 4-webs of asymptotic lines of spacelike surfaces in de Sitter 5-space. (English) Zbl 1467.53014

Summary: In this paper, we continue the study of the geometry of spacelike surfaces in de Sitter 5-space. We define invariants of the second fundamental form and consider their geometrical properties. We also investigate generic properties of the surfaces defined as solutions of the equations of asymptotic directions (AD) and lightlike binormal directions (BD) of spacelike surfaces.


53A35 Non-Euclidean differential geometry
53B30 Local differential geometry of Lorentz metrics, indefinite metrics
58K05 Critical points of functions and mappings on manifolds
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