Let $M = (\mathbb{R}^N, \mathcal{L}, \ell)$ be a D1744: Lebesgue measure space such that
| (i) | $E \in \mathcal{L}$ is a D1109: Measurable set in $M$ |
Then
\begin{equation}
- E
\in \mathcal{L}
\end{equation}