( - \mu N \leq f \leq \mu N ^ { \prime }
Ebatzi: x
x\in \mathrm{R}
f\geq -N\mu \text{ and }f\leq 0
Ebatzi: μ
\left\{\begin{matrix}\mu \leq -\frac{f}{N}\text{, }&N<0\text{ and }f\leq 0\\\mu =-\frac{f}{N}\text{, }&N\neq 0\text{ and }f\leq 0\\\mu \leq 0\text{, }&N\leq 0\text{ and }f=0\\\mu =0\text{, }&f=0\\\mu \geq -\frac{f}{N}\text{, }&N>0\text{ and }f\leq 0\\\mu \in \mathrm{R}\text{, }&N=0\text{ and }f=0\\\mu \geq 0\text{, }&N\geq 0\text{ and }f=0\end{matrix}\right.
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