Geodesic
On~bending of a~convex surface to a~convex surface with prescribed spherical image
Matematičeskie zametki, Tome 58 (1995) no. 2, pp. 295-300.

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We prove the following theorem. Let $F$ be a regular convex surface homeomorphic to the disk. Suppose the Gaussian curvature of $F$ is positive and the geodesic curvature of its boundary is positive as well. Let $G$ be a convex domain on the unit sphere bounded by a smooth curve and strictly contained in a hemisphere. Let $P$ be an arbitrary point on the boundary of $F$ and $P^*$ be an arbitrary point on the boundary of $G$. If the area of $G$ is equal to the integral curvature of the surface $F$, then there exists a continuous bending of the surface $F$ to a convex surface $F'$ such that the spherical image of $F'$ coincides with $G$ and $P^*$ is the image of the point in $F'$ corresponding to the point $P\in F$ under the isometry. 
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     title = {On~bending of a~convex surface to a~convex surface with prescribed spherical image},
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A. V. Pogorelov. On~bending of a~convex surface to a~convex surface with prescribed spherical image. Matematičeskie zametki, Tome 58 (1995) no. 2, pp. 295-300. http://geodesic.mathdoc.fr/item/MZM_1995_58_2_a10/

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