Geodesic
Criteria for the nonexistence of periodic orbits in planar differential systems
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2023), pp. 3-7

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In this work we summarize some well-known criteria for the nonexistence of periodic orbits in planar differential systems. Additionally we present two new criteria and illustrate with examples these criteria. 
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Jaume Giné; Jaume Llibre. Criteria for the nonexistence of periodic orbits in planar differential systems. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2023), pp. 3-7. http://geodesic.mathdoc.fr/item/BASM_2023_1_a0/