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请大家帮帮忙看看下面这个非线性的式子,写成Fokker-Planck equation use Ito interpolation 要怎么写阿?The relative return $x_{(t+1)}$ at time ${t+1}$ is defined as:
\begin{equation}
x _{(t+1)}=ax _{(t)}-bx _{(t)}^3+\sqrt{c{x_{(t)}^2+k}}\varepsilon_{(t)}
\end{equation}
Here the variable $a$, $b$ and $c$ are parameters and $\varepsilon_{(t)}$ is a white noise process.
万分感谢!