Abstract
We study surfaces M 2 in the four-dimensional affine space \(R^4 \) equipped with its usual torsion-free connection D and parallel volume form given by the determinant.
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Verstraelen, L., Vrancken, L. & Witowicz, P. Indefinite Affine Umbilical Surfaces in \(R^4 \) . Geometriae Dedicata 79, 109–119 (2000). https://doi.org/10.1023/A:1005039604280
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DOI: https://doi.org/10.1023/A:1005039604280