Geodesic
Remarks on the uniqueness of second order $\rm ODEs$
Applications of Mathematics, Tome 56 (2011) no. 1, pp. 161-172.

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We are concerned with the uniqueness problem for solutions to the second order ODE of the form $x''+f(x,t)=0$, subject to appropriate initial conditions, under the sole assumption that $f$ is non-decreasing with respect to $x$, for each $t$ fixed. We show that there is non-uniqueness in general; on the other hand, several types of reasonable additional assumptions make the problem uniquely solvable. The interest in this problem comes, among other, from the study of oscillations of lumped parameter systems with implicit constitutive relations.
DOI : 10.1007/s10492-011-0014-3
Classification : 34A12, 34C10, 34M10
Keywords: second order ODEs; uniqueness of solutions; oscillations 
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Pražák, Dalibor. Remarks on the uniqueness of second order $\rm ODEs$. Applications of Mathematics, Tome 56 (2011) no. 1, pp. 161-172. doi : 10.1007/s10492-011-0014-3. http://geodesic.mathdoc.fr/articles/10.1007/s10492-011-0014-3/

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