Geodesic
Families of submanifolds of constant negative curvature of many-dimensional Euclidean space
Sbornik. Mathematics, Tome 197 (2006) no. 2, pp. 139-152 Cet article a éte moissonné depuis la source Math-Net.Ru

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A family of $n$-dimensional submanifolds of constant negative curvature $K_0$ of the $(2n-1)$-dimensional Euclidean space $E^{2n-1}$ is considered and included in an orthogonal system of coordinates. For $n=2$ such a system of coordinates was considered by Bianchi. The concept of a many-dimensional Bianchi system of coordinates is introduced. The following result is central in the paper. Theorem 1. {\it Assume that a ball of radius $\rho$ in the Euclidean space $E^{2n-1}$ carries a regular Bianchi system of coordinates such that $K_0\leqslant -1$. Then} $$ \rho\leqslant\frac\pi4\,. $$ Bibliography: 12 titles. 
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Yu. A. Aminov. Families of submanifolds of constant negative curvature of many-dimensional Euclidean space. Sbornik. Mathematics, Tome 197 (2006) no. 2, pp. 139-152. http://geodesic.mathdoc.fr/item/SM_2006_197_2_a0/

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