Jean-Pierre Ezin

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We give a sufficient condition for a lightlike isotropic submanifold M , of dimension n, which is not totally geodesic in a semi-Riemannian manifold of constant curvature c and of dimension n + p (n < p), to admit a reduction of codimension. We show that this condition is a necessary and sufficient condition on the first transversal space of M . There are(More)
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