diff -r 7bb89635eb51 -r a45121ffcfcb doc-src/IsarRef/Thy/document/First_Order_Logic.tex
--- a/doc-src/IsarRef/Thy/document/First_Order_Logic.tex	Thu Sep 29 09:37:59 2011 +0200
+++ b/doc-src/IsarRef/Thy/document/First_Order_Logic.tex	Mon Oct 03 11:14:19 2011 +0200
@@ -68,7 +68,7 @@
 \begin{isamarkuptext}%
 \noindent Substitution is very powerful, but also hard to control in
   full generality.  We derive some common symmetry~/ transitivity
-  schemes of as particular consequences.%
+  schemes of \isa{equal} as particular consequences.%
 \end{isamarkuptext}%
 \isamarkuptrue%
 \isacommand{theorem}\isamarkupfalse%