--- a/doc-src/IsarRef/Thy/Symbols.thy Tue May 03 14:23:40 2011 +0200
+++ b/doc-src/IsarRef/Thy/Symbols.thy Tue May 03 15:07:36 2011 +0200
@@ -1,5 +1,5 @@
theory Symbols
-imports Pure
+imports Base Main
begin
chapter {* Predefined Isabelle symbols \label{app:symbols} *}