Let $X, Y \in \text{Random}(\mathbb{R})$ be a D3161: Random real number such that

(i)	\begin{equation} \exists \, y \in \mathbb{R} : Y = y \end{equation}

Then \begin{equation} \mathbb{E} (X \mid Y) \overset{a.s.}{=} \mathbb{E} X \end{equation}