The stability of a system that integrabel around the fixed point can be learned of the existence of integralnya. And the concept of stability which can be used for systems in which one of them integrabel the stability of Liapunov (see [5]). Therefore, for the system discussed in this paper we use the concept of Liapunov stability to check the stability of the fixed point. Consider a dynamical system (13). Note that the Hessian matrix of the immediate vicinity of a fixed point (x, y ∗ ∗) = (±1, ±1) can be written as
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