Geodesic
Some remarks on Nagumo's theorem
Czechoslovak Mathematical Journal, Tome 62 (2012) no. 1, pp. 235-242.

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We provide a simpler proof for a recent generalization of Nagumo's uniqueness theorem by A. Constantin: On Nagumo's theorem. Proc. Japan Acad., Ser. A 86 (2010), 41–44, for the differential equation $x'=f(t,x)$, $ x(0)=0$ and we show that not only is the solution unique but the Picard successive approximations converge to the unique solution. The proof is based on an approach that was developed in Z. S. Athanassov: Uniqueness and convergence of successive approximations for ordinary differential equations. Math. Jap. 35 (1990), 351–367. Some classical existence and uniqueness results for initial-value problems for ordinary differential equations are particular cases of our result.
DOI : 10.1007/s10587-012-0008-7
Classification : 34A12, 34A34, 34A45
Keywords: ordinary differential equation; uniqueness 
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Mejstrik, Thomas. Some remarks on Nagumo's theorem. Czechoslovak Mathematical Journal, Tome 62 (2012) no. 1, pp. 235-242. doi : 10.1007/s10587-012-0008-7. http://geodesic.mathdoc.fr/articles/10.1007/s10587-012-0008-7/

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