Geometric criterium in the center problem
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In this paper we use a geometric criterium based in the classical method of the construction of Lyapunov functions to determine if a differential system has a focus or a center at a singular point. This criterium is proved to be useful for several examples studied in previous works with other more specific methods.
Is part ofMediterranean Journal of Mathematics, 2016, vol. 13, num. 5, p. 2593-2611
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