doc-src/Tutorial/Misc/NatSum.thy

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc-src/Tutorial/Misc/NatSum.thy	Wed Aug 26 17:27:27 1998 +0200
@@ -0,0 +1,6 @@
+NatSum = Main +
+consts sum :: nat => nat
+primrec
+"sum 0 = 0"
+"sum (Suc n) = Suc n + sum n"
+end