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Boundedness of the solutions of the equation $y'' + x y = 0 $ as $x rightarrow +infty$


Behaviour of Solutions to $x^2y'' + alpha xy'+ beta y = 0$ as $x to 0$ and $x to infty$Modified Airy differential equationHow to show that all solutions of $ay''+by'+cy=0$ approach $0$ as $t rightarrow infty$Existence and Uniqueness of solutions to a differential equation.How do I solve for simple pendulum?Inhomogeneous Airy EquationUnderstanding solutions to the Mathieu Equation in the context of Classical MechanicsBehavior of the solution of the equation $f'' = -x f $ as $xrightarrow infty$Boundedness of Solutions of Differential EquationNonstandard independent solutions of the Airy equation













2












$begingroup$


This is the Airy equation. We know that the two solutions are both bounded as $xrightarrow infty$.



The picture is that the solution just oscillates with higher and higher frequency ($propto sqrtx$) but its amplitude does not increase.



Can we develop this into a general theorem?



Are the solutions of the equation $y''+ x^2 y = 0 $ bounded in both directions?










share|cite|improve this question









$endgroup$











  • $begingroup$
    Look up perturbation theory.
    $endgroup$
    – MachineLearner
    Mar 17 at 23:30















2












$begingroup$


This is the Airy equation. We know that the two solutions are both bounded as $xrightarrow infty$.



The picture is that the solution just oscillates with higher and higher frequency ($propto sqrtx$) but its amplitude does not increase.



Can we develop this into a general theorem?



Are the solutions of the equation $y''+ x^2 y = 0 $ bounded in both directions?










share|cite|improve this question









$endgroup$











  • $begingroup$
    Look up perturbation theory.
    $endgroup$
    – MachineLearner
    Mar 17 at 23:30













2












2








2





$begingroup$


This is the Airy equation. We know that the two solutions are both bounded as $xrightarrow infty$.



The picture is that the solution just oscillates with higher and higher frequency ($propto sqrtx$) but its amplitude does not increase.



Can we develop this into a general theorem?



Are the solutions of the equation $y''+ x^2 y = 0 $ bounded in both directions?










share|cite|improve this question









$endgroup$




This is the Airy equation. We know that the two solutions are both bounded as $xrightarrow infty$.



The picture is that the solution just oscillates with higher and higher frequency ($propto sqrtx$) but its amplitude does not increase.



Can we develop this into a general theorem?



Are the solutions of the equation $y''+ x^2 y = 0 $ bounded in both directions?







ordinary-differential-equations






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked Mar 17 at 23:28









JohnJohn

1874




1874











  • $begingroup$
    Look up perturbation theory.
    $endgroup$
    – MachineLearner
    Mar 17 at 23:30
















  • $begingroup$
    Look up perturbation theory.
    $endgroup$
    – MachineLearner
    Mar 17 at 23:30















$begingroup$
Look up perturbation theory.
$endgroup$
– MachineLearner
Mar 17 at 23:30




$begingroup$
Look up perturbation theory.
$endgroup$
– MachineLearner
Mar 17 at 23:30










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