Abstract
For a submanifoldM n of a Riemannian manifoldM q, the concept of a torsion bivector at the point x ∈M n for given one- and two-dimensional directions fromT x M n is introduced using only the first and second fundamental forms ofM n. Its relation to the concept of Gaussian torsion is then established. It is proved that: 1) equality to zero of the torsion bivector is necessary and, whenM n is a nondevelopable surface of a space of constant curvature with nonzero second fundamental form, is also sufficient for the "flattening" ofM n into some totally geodesicM n+1 inM q; 2) when n = 2, the independence of the nonzero torsion bivector of direction characterizes a minimalM 2 inM q.
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Translated from Ukrainskii Geometricheskii Sbornik, No. 34, pp. 39–42, 1991.
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Dudkin, A.A. The torsion of a submanifold of a Riemannian manifold. J Math Sci 69, 851–853 (1994). https://doi.org/10.1007/BF01250813
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DOI: https://doi.org/10.1007/BF01250813