Equation (2.2.2.1)
\begin{equation} \tag{2.2.2.1} x = \gamma + d, \qquad \gamma \in \mathbb{Q},\ d \in D. \end{equation}
This equation appears in Lemma 2.2.2.
\begin{equation} \tag{2.2.2.1} x = \gamma + d, \qquad \gamma \in \mathbb{Q},\ d \in D. \end{equation}
This equation appears in Lemma 2.2.2.