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  • https://ukrayinska.libretexts.org/%D0%86%D0%BD%D0%B6%D0%B5%D0%BD%D0%B5%D1%80%D0%BD%D0%B0/%D0%95%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE%D1%82%D0%B5%D1%85%D0%BD%D1%96%D0%BA%D0%B0/%D0%95%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0/%D0%9F%D1%80%D1%8F%D0%BC%D0%B0_%D0%B5%D0%BD%D0%B5%D1%80%D0%B3%D1%96%D1%8F_(Mitofsky)/14%3A_%D0%90%D0%BD%D0%B0%D0%BB%D1%96%D0%B7_%D0%B1%D1%80%D0%B5%D1%85%D0%BD%D1%96/14.07%3A_%D0%9F%D1%80%D0%BE%D0%B1%D0%BB%D0%B5%D0%BC%D0%B8
    \(t \rightarrow \tilde{t} = (−1)^{\mathfrak{n}} t \quad \text{and} \quad y \rightarrow \tilde{y} = (−1)^{\mathfrak{n}} y\). Знайти нескінченно малі генератори для рівняння,\(\ddot{y} + y^{-3} = 0\). (...\(t \rightarrow \tilde{t} = (−1)^{\mathfrak{n}} t \quad \text{and} \quad y \rightarrow \tilde{y} = (−1)^{\mathfrak{n}} y\). Знайти нескінченно малі генератори для рівняння,\(\ddot{y} + y^{-3} = 0\). (Ця проблема обговорюється в [190].) \[U_7 = y \cos (\omega_0t) \partial_t − \omega_0y 2 \sin (\omega_0t) \partial_y \nonumber \] \[U_8 = y \sin (\omega_0t) \partial_t + \omega_0y 2 \cos (\omega_0t) \partial_y \nonumber \]