Аннотация:
The necessary and sufficient conditions are presented for oscillability of the equation
$\ddot x+\omega^2x=0$ with variable coefficient $\omega$.
Ключевые слова:linear ocsillators of variable frequency, Riccati's equation and oscillability of linear systems, integral conditions of Wintner and Kamenev, explicit construction of a support solution.
Полный текст:
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