diff -r 60b31a24f1a6 -r efb799c5ed3c doc-src/Tutorial/Misc/Defs.thy
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc-src/Tutorial/Misc/Defs.thy	Wed Aug 26 17:27:27 1998 +0200
@@ -0,0 +1,5 @@
+Defs = Types +
+consts nand, exor :: gate
+defs nand_def "nand A B == ~(A & B)"
+     exor_def "exor A B == A & ~B | ~A & B"
+end