Geodesic
N.~V.~Stepanov and his geometric theory of ordinary differential equations
Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Differential equations. Mathematical physics, Tome 139 (2017), pp. 3-8.

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We review main results of the geometric theory of ordinary differential equations obtained by the eminent Russian geometer N. V. Stepanov (1926–1991). Some of results of Stepanov are illustrated by examples of third- and five-order equations.
Keywords: ordinary differential equation, connection, differential-algebraic characteristics, symmetry group.
Mots-clés : invariant, classification 
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     title = {N.~V.~Stepanov and his geometric theory of ordinary differential equations},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
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G. A. Banaru. N.~V.~Stepanov and his geometric theory of ordinary differential equations. Itogi nauki i tehniki. Sovremennaâ matematika i eë priloženiâ. Tematičeskie obzory, Differential equations. Mathematical physics, Tome 139 (2017), pp. 3-8. http://geodesic.mathdoc.fr/item/INTO_2017_139_a0/