Let $M = (\mathbb{R}^D, \mathcal{L}, \ell)$ be a D1744: Lebesgue measure space such that

(i)	$E, F \in \mathcal{L}$ are each a D1779: Lebesgue set in $M$
(ii)	\begin{equation} E \subseteq F \end{equation}

Then \begin{equation} \ell(E) \leq \ell(F) \end{equation}