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src/FOL/ex/Natural_Numbers.thy
changeset 11679 afdbee613f58
parent 11673 79e5536af6c4
child 11696 233362cfecc7 
--- a/src/FOL/ex/Natural_Numbers.thy	Thu Oct 04 15:28:26 2001 +0200
+++ b/src/FOL/ex/Natural_Numbers.thy	Thu Oct 04 15:29:22 2001 +0200
@@ -18,7 +18,7 @@
 
 axioms
   induct [induct type: nat]:
-    "P(0) \<Longrightarrow> (!!x. P(x) ==> P(Suc(x))) ==> P(n)"
+    "P(0) ==> (!!x. P(x) ==> P(Suc(x))) ==> P(n)"
   Suc_inject: "Suc(m) = Suc(n) ==> m = n"
   Suc_neq_0: "Suc(m) = 0 ==> R"
   rec_0: "rec(0, a, f) = a"
isabelle