wip dependency insertion

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@@ -832,6 +832,14 @@ Not applicable.
 
 Not applicable.
 
+\subsection{Base Acyclic}
+
+Consider some $D \isin C$.  We will show that $D \not\in \pqy$.
+By $\merge$, $D \isin L \lor D \isin R^+ \lor D = C$.
+
+For $D \isin L$, Base Acyclic for L suffices.  For $D \isin R^+$,
+Insertion Acyclic suffices.  For $D = C$, trivial.  $\qed$.
+
 xxx up to here
 
 \section{Merge}