diff -r 9ac4c2240d89 -r 484956c42436 doc-src/Intro/foundations.tex
--- a/doc-src/Intro/foundations.tex	Tue Jul 16 15:44:31 1996 +0200
+++ b/doc-src/Intro/foundations.tex	Tue Jul 16 15:45:36 1996 +0200
@@ -1062,7 +1062,7 @@
   \lbrakk\;& P\disj P \Imp \Var{P@1}\disj\Var{Q@1}; \\
            & \List{P\disj P ;\; \Var{P@1}} \Imp \Var{R@1};    \\
            & \List{P\disj P ;\; \Var{Q@1}} \Imp \Var{R@1}     \\
-  \rbrakk\;& \Imp \Var{R@1}
+  \rbrakk\;& \Imp (P\disj P \Imp \Var{R@1})
   \end{array} 
 \]
 Unification takes the simultaneous equations