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src/FOL/ex/Nat.thy
changeset 55380 4de48353034e
parent 41779 a68f503805ed
child 58889 5b7a9633cfa8 
--- a/src/FOL/ex/Nat.thy	Mon Feb 10 14:33:47 2014 +0100
+++ b/src/FOL/ex/Nat.thy	Mon Feb 10 17:20:11 2014 +0100
@@ -10,7 +10,7 @@
 begin
 
 typedecl nat
-arities nat :: "term"
+instance nat :: "term" ..
 
 axiomatization
   Zero :: nat  ("0") and
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