Abstract
In this paper, we generalize the systematic approximation and the systematic adiabatic approximation developed by G. Schöner and H. Haken to the stochastic systems driven by O-U noises. After eliminating the fast variables , we introduce a new family of stochastic processes in the equations for the order parameters . A typical model serves to illustrate how to derive the equation for the order parameter and how to calculate the statistical properties of the new stochastic processes . Some significant discussions and conclusions are given in Sec. V.
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