Abstract
In this paper, we use a geometric criterium based on 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.
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Algaba, A., García, C. & Giné, J. Geometric Criterium in the Center Problem. Mediterr. J. Math. 13, 2593–2611 (2016). https://doi.org/10.1007/s00009-015-0641-0
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DOI: https://doi.org/10.1007/s00009-015-0641-0