On curves and submanifolds in an indefinite-Riemannian manifold
The purpose of this paper is to study ''circle'' and ''helix'' in an indefinite Riemannian (especially Lorentzian) manifold and to prove results similar to results in Riemannian manifolds, connected for example with the first and second curvatures. Several examples are given.
scientific article; zbMATH DE number 3944725