diff -r 75e163863e16 -r 8ce8c4d13d4d src/ZF/nat.thy
--- a/src/ZF/nat.thy	Fri Sep 17 12:53:53 1993 +0200
+++ b/src/ZF/nat.thy	Fri Sep 17 16:16:38 1993 +0200
@@ -9,7 +9,7 @@
 Nat = Ord + Bool + 
 consts
     nat 	::      "i"
-    nat_case    ::      "[i, i, i=>i]=>i"
+    nat_case    ::      "[i, i=>i, i]=>i"
     nat_rec     ::      "[i, i, [i,i]=>i]=>i"
 
 rules
@@ -17,10 +17,10 @@
     nat_def     "nat == lfp(Inf, %X. {0} Un {succ(i). i:X})"
 
     nat_case_def
-	"nat_case(k,a,b) == THE y. k=0 & y=a | (EX x. k=succ(x) & y=b(x))"
+	"nat_case(a,b,k) == THE y. k=0 & y=a | (EX x. k=succ(x) & y=b(x))"
 
     nat_rec_def
 	"nat_rec(k,a,b) ==   \
-\   	  wfrec(Memrel(nat), k, %n f. nat_case(n, a, %m. b(m, f`m)))"
+\   	  wfrec(Memrel(nat), k, %n f. nat_case(a, %m. b(m, f`m), n))"
 
 end