\section{Invariants}
-\begin{gather}
-\eqn{No replay:}{ C \has D \implies C \ge D } \\
-\eqn{Unique base:}{ \mathop{\forall}_{C \in \py} \pends{C}{\pn} = \{ B \} }
-\end{gather}
+\[ \eqn{No replay:}{
+ C \has D \implies C \ge D } \]
+\[\eqn{Unique base:}{
+ \mathop{\forall}_{C \in \py} \pends{C}{\pn} = \{ B \} }\]
\section{Test more symbols}