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src/HOL/Library/Fraction_Field.thy
changeset 40815 6e2d17cc0d1d
parent 39910 10097e0a9dbd
child 40822 98a5faa5aec0 
--- a/src/HOL/Library/Fraction_Field.thy	Mon Nov 29 12:15:14 2010 +0100
+++ b/src/HOL/Library/Fraction_Field.thy	Mon Nov 29 13:44:54 2010 +0100
@@ -43,7 +43,7 @@
 qed
   
 lemma equiv_fractrel: "equiv {x. snd x \<noteq> 0} fractrel"
-  by (rule equiv.intro [OF refl_fractrel sym_fractrel trans_fractrel])
+  by (rule equivI [OF refl_fractrel sym_fractrel trans_fractrel])
 
 lemmas UN_fractrel = UN_equiv_class [OF equiv_fractrel]
 lemmas UN_fractrel2 = UN_equiv_class2 [OF equiv_fractrel equiv_fractrel]
isabelle