Geodesic
The Groups of Motions of Two-Dimensional Helmholtz Geometries as Solutions to Functional Equations
Sibirskij žurnal industrialʹnoj matematiki, Tome 12 (2009) no. 4, pp. 12-22 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider the problem of finding the local groups of all motions of two-dimensional Helmholtz geometries, which reduces to solving functional equations.
Keywords: phenomenologically symmetric geometry, the group of motions, functional equation. 
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R. A. Bogdanova. The Groups of Motions of Two-Dimensional Helmholtz Geometries as Solutions to Functional Equations. Sibirskij žurnal industrialʹnoj matematiki, Tome 12 (2009) no. 4, pp. 12-22. http://geodesic.mathdoc.fr/item/SJIM_2009_12_4_a1/

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