Monotonous property of non-oscillations of the damped Duffing’s equation

In this paper, we give a qualitative study to the damped Duffing’s equation by means of the qualitative theory of planar systems. Under certain parametric conditions, the monotonous property of the bounded non-oscillations is obtained. Explicit exact solutions are obtained by a direct method and application of this approach to a reaction–diffusion equation is presented.

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