doc-src/Tutorial/Misc/Tree.thy
author wenzelm
Sun, 14 Oct 2001 20:09:19 +0200
changeset 11764 fd780dd6e0b4
parent 5377 efb799c5ed3c
permissions -rw-r--r--
use ObjectLogic;

Tree = Main +
datatype 'a tree = Tip | Node ('a tree) 'a ('a tree)
end