--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/doc-src/Intro/arith.thy Wed Nov 10 05:06:55 1993 +0100
@@ -0,0 +1,6 @@
+Arith = FOL +
+classes arith < term
+consts "0" :: "'a::arith" ("0")
+ "1" :: "'a::arith" ("1")
+ "+" :: "['a::arith,'a] => 'a" (infixl 60)
+end