Geodesic
Bounded complete weakly nonregular surfaces with negative curvature bounded away from zero
Sbornik. Mathematics, Tome 44 (1983) no. 4, pp. 501-509 Cet article a éte moissonné depuis la source Math-Net.Ru

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In three-dimensional Euclidean space we construct a bounded saddle surface of class $C^1$, complete in its intrinsic metric. This surface has $C^\infty$ regularity everywhere except for a countable set of singular points (saddle points of the third order, isolated in the intrinsic metric). The Gaussian curvature in the sense of A. D. Aleksandrov is defined on the whole surface, is continuous and differentiable, and satisfies the inequality $K\leqslant-1$. Bibliography: 10 titles. 
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     author = {\`E. R. Rozendorn},
     title = {Bounded complete weakly nonregular surfaces with negative curvature bounded away from zero},
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     year = {1983},
     volume = {44},
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     url = {http://geodesic.mathdoc.fr/item/SM_1983_44_4_a7/}
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È. R. Rozendorn. Bounded complete weakly nonregular surfaces with negative curvature bounded away from zero. Sbornik. Mathematics, Tome 44 (1983) no. 4, pp. 501-509. http://geodesic.mathdoc.fr/item/SM_1983_44_4_a7/

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