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| | <math display="block"> | | <math display="block"> |
| − | \dot x = r - x - e^x | + | \begin{aligned} |
| − | =r - x - (1 - x + \frac [x^2][2!] + \cdots) | + | \dot{x} & =r-x-\mathrm{e}^{-x} \\ |
| − | =(r - 1) - \frac[1][2]x^2 + \cdots | + | & =r-x-\left[1-x+\frac{x^{2}}{2!}+\cdots\right] \\ |
| | + | & =(r-1)-\frac{x^{2}}{2}+\cdots |
| | + | \end{aligned} |
| | </math> | | </math> |
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