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Abstract: We first describe the numerical invariants attached to the second fundamentalform of a spacelike surface in four-dimensional Minkowski space. We then studythe configuration of the nu-principal curvature lines on a spacelike surface,when the normal field nu is lightlike the lightcone configuration. Someobservations on the mean directionally curved lines and on the asymptotic lineson spacelike surfaces end the paper.



Autor: Pierre Bayard, Federico Sánchez-Bringas

Fuente: https://arxiv.org/







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