- $m \in $$\mathbb{R}$$\backslash \left\{ { - 1} \right\}$
- $m \in $$\mathbb{R}$
- $m \in \left( { - \infty ;0} \right]\backslash \left\{ { - 1} \right\}$
- $m \in \left( {0; + \infty } \right)$