Geodesic
Tangent Transformations of the Cayley–Darboux Equation
Sibirskij žurnal čistoj i prikladnoj matematiki, Tome 9 (2009) no. 1, pp. 39-44
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In this paper it's proved that group of the tangent transformations of the Cayley-Darboux equation coincides with the group of the local transformations and with the group of the conformal transformations. 
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     title = {Tangent {Transformations} of the {Cayley{\textendash}Darboux} {Equation}},
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M. V. Neshchadim. Tangent Transformations of the Cayley–Darboux Equation. Sibirskij žurnal čistoj i prikladnoj matematiki, Tome 9 (2009) no. 1, pp. 39-44. http://geodesic.mathdoc.fr/item/VNGU_2009_9_1_a3/

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