diff --git a/books/bookvol10.4.pamphlet b/books/bookvol10.4.pamphlet
index 6f4098c..4650eeb 100644
--- a/books/bookvol10.4.pamphlet
+++ b/books/bookvol10.4.pamphlet
@@ -22660,7 +22660,7 @@ ExpressionFunctions2(R:OrderedSet, S:OrderedSet):
     if S has Ring and R has Ring then
       map(f, r) == map(f, r)$F2
     else
-      map(f, r) == map(map(f, #1), retract r)$E2
+      map(f, r) == map(x1 +-> map(f, x1), retract r)$E2
 
 @
 <<EXPR2.dotabb>>=
diff --git a/changelog b/changelog
index b6585ee..26cb3eb 100644
--- a/changelog
+++ b/changelog
@@ -1,3 +1,5 @@
+20090518 tpd src/axiom-website/patches.html 20090518.06.tpd.patch
+20090518 tpd books/bookvol10.4 EXPR2 +-> conversion
 20090518 tpd src/axiom-website/patches.html 20090518.05.tpd.patch
 20090518 tpd books/bookvol10.3 SMTS +-> conversion
 20090518 tpd src/axiom-website/patches.html 20090518.04.tpd.patch
diff --git a/src/axiom-website/patches.html b/src/axiom-website/patches.html
index 1a4f5c5..aec081d 100644
--- a/src/axiom-website/patches.html
+++ b/src/axiom-website/patches.html
@@ -1348,5 +1348,7 @@ bookvol10.4 GBEUCLID +-> conversion<br/>
 bookvol10.4 ESCONT +-> conversion<br/>
 <a href="patches/20090518.05.tpd.patch">20090518.05.tpd.patch</a>
 bookvol10.3 SMTS +-> conversion<br/>
+<a href="patches/20090518.06.tpd.patch">20090518.06.tpd.patch</a>
+bookvol10.4 EXPR2 +-> conversion<br/>
  </body>
 </html>