Geodesic
Geodesic transformations of distributions of sub-Riemannian manifolds
Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Proceedings of the International Conference "Classical and Modern Geometry" Dedicated to the 100th Anniversary of the Birth of Professor Vyacheslav Timofeevich Bazylev. Moscow, April 22-25, 2019. Part 4, Tome 182 (2020), pp. 14-18.

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Let $M$ be a sub-Riemannian contact-type manifold endowed with a distribution $D$. Using an endomorphism $N: D\to D$ of the distribution $D$, one can prolong the inner connection, which transfers admissible vectors along admissible curves on the manifold $M$, up to a connection in the vector bundle $(D,\pi,M)$, where $\pi:D\to M$ is the natural projection. The connection obtained is called the $N$-prolonged connection. The setting of an $N$-prolonged connection is equivalent to the setting of an $N$-prolonged sub-Riemannian on the distribution $D$. Using the structure equations of the $N$-prolonged structure, we calculate the coefficients of the Levi-Civita connection obtained by the prolongation of the Riemannian manifold. We prove that if a distribution $D$ of a sub-Riemannian manifold is not integrable, then two $N$-prolonged, contact-type, sub-Riemannian structures, one of which is determined by the zero endomorphism and the other by an arbitrary nonzero endomorphism, belong to distinct geodesic classes.
Keywords: sub-Riemannian manifold of contact type, $N$-extended connection, geodesic transformation. 
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     title = {Geodesic transformations of distributions of {sub-Riemannian} manifolds},
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S. V. Galaev. Geodesic transformations of distributions of sub-Riemannian manifolds. Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Proceedings of the International Conference "Classical and Modern Geometry" Dedicated to the 100th Anniversary of the Birth of Professor Vyacheslav Timofeevich Bazylev. Moscow, April 22-25, 2019. Part 4, Tome 182 (2020), pp. 14-18. http://geodesic.mathdoc.fr/item/INTO_2020_182_a2/

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