Geodesic
Periodic Solutions of Scalar Differential Equations without Uniqueness
Bollettino della Unione matematica italiana, Série 9, Tome 2 (2009) no. 2, pp. 445-448

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

The note presents a simple proof of a result due to F. Obersnel and P. Omari on the existence of periodic solutions with an arbitrary period of the first order scalar differential equation, provided equation has an n-periodic solution with the minimal period n > 1. 
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     title = {Periodic {Solutions} of {Scalar} {Differential} {Equations} without {Uniqueness}},
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Sȩdziwy, Stanisław. Periodic Solutions of Scalar Differential Equations without Uniqueness. Bollettino della Unione matematica italiana, Série 9, Tome 2 (2009) no. 2, pp. 445-448. http://geodesic.mathdoc.fr/item/BUMI_2009_9_2_2_a8/