Geodesic
On double-ruled hypersurfaces in $\bold R^4$
Commentationes Mathematicae Universitatis Carolinae, Tome 38 (1997) no. 2, pp. 407-411.

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We classify locally the induced Riemannian metrics of all irreducible double-ruled hypersurfaces in $\boldkey R^4$.
Classification : 53A07, 53B20, 53C20, 53C40, 53C42
Keywords: Riemannian manifold; ruled hypersurface 
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     title = {On double-ruled hypersurfaces in $\bold R^4$},
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     pages = {407--411},
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Kowalski, Oldřich; Vlášek, Zdeněk. On double-ruled hypersurfaces in $\bold R^4$. Commentationes Mathematicae Universitatis Carolinae, Tome 38 (1997) no. 2, pp. 407-411. http://geodesic.mathdoc.fr/item/CMUC_1997__38_2_a22/