diff -r ff13585fbdab -r d8d0f8f51d69 src/HOL/Complex/ex/Sqrt_Script.thy
--- a/src/HOL/Complex/ex/Sqrt_Script.thy	Sat May 27 17:42:00 2006 +0200
+++ b/src/HOL/Complex/ex/Sqrt_Script.thy	Sat May 27 17:42:02 2006 +0200
@@ -52,9 +52,9 @@
 
 subsection {* The set of rational numbers *}
 
-constdefs
+definition
   rationals :: "real set"    ("\<rat>")
-  "\<rat> \<equiv> {x. \<exists>m n. n \<noteq> 0 \<and> \<bar>x\<bar> = real (m::nat) / real (n::nat)}"
+  "\<rat> = {x. \<exists>m n. n \<noteq> 0 \<and> \<bar>x\<bar> = real (m::nat) / real (n::nat)}"
 
 
 subsection {* Main theorem *}