Geodesic
Front Asymptotics of a Flat Sub-Riemannian Structure on the Engel Distribution
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Optimal Control and Dynamical Systems, Tome 321 (2023), pp. 62-76.

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We approximate the front of a flat sub-Riemannian structure on the Engel distribution in a neighborhood of a non-subanalytic singularity by the front of a control system integrable in elementary functions. As a corollary, we find the asymptotics of the exponential map of a flat sub-Riemannian structure on the Engel distribution.
Keywords: sphere and front of a sub-Riemannian structure, Engel distribution, exponential map. 
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I. A. Bogaevsky. Front Asymptotics of a Flat Sub-Riemannian Structure on the Engel Distribution. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Optimal Control and Dynamical Systems, Tome 321 (2023), pp. 62-76. http://geodesic.mathdoc.fr/item/TM_2023_321_a3/

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