One more image.

talks/20211206.cambium/talk.tex

@@ -503,20 +503,18 @@
 \begin{frame}{Logical Deallocation}
 
   Logical deallocation of a block is a \emph{ghost operation:}
-  \bgroup\renewcommand\star{\;\ordinarystar\;}
-  \[
-    \loc\fpointsto{1}{\btuple\vals} \star \loc\vfpointedby{1}\lsv
-    \star \pure{\dom{\lsv}\subseteq\{\loc\}}
-    \quad \supd \quad
-    \ddag{\{\loc\}} \star \SC{\sz{\btuple\vals}}
-  \]
-  % TODO re-draw this rule by hand
+  \begin{center}
+  \includegraphics[width=.75\textwidth]{free-singleton}
+  \end{center}
 
+\end{frame}
+
+\begin{frame}{Deferred Predecessor Deletion}
+
+  Deletion of deallocated predecessors can be \emph{deferred:}
   \begin{center}
   \includegraphics[width=.75\textwidth]{cleanup}
   \end{center}
-  \vspace{-7mm}
-  Deletion of deallocated predecessors can be \emph{deferred}.
 
 \end{frame}