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## Analysis of the condition \${\germ A}(k)\$ for four-dimensional systems of differential equations. (Russian)

Authors: Bronshtejn I. U., Kopanskij A. Ya.

### Abstract

Finitely smooth normal forms of four-dimensional systems of differential equations in the vicinity of a hyperbolic singular point are investigated by using the condition \$\frak A (k)\$ introduced earlier.

Institutul de Matematică Academia de Ştiinţe
str. Academiei 5, MD-2028 Chişinău, Moldova