Use the Lyapunov function V (x, y) = x4 + 2y2 10 to investigate the invariant

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Use the Lyapunov function V (x, y) = x4 + 2y2 − 10 to investigate the invariant sets of the system

˙ x = y − x(x4 + 2y2 − 10), ˙ y = −x3 − 3y5(x4 + 2y2 − 10).

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