Singular points of lightlike hypersurfaces of the de Sitter space
Maks A. Akivis, Vladislav V. Goldberg
Abstract
The authors study singular points of lightlike hypersurfaces of the de Sitter space Sn+11 and the geometry of hypersurfaces and use them for construction of an invariant normalization and an invariant affine connection of lightlike hypersurfaces.
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