doc-src/Tutorial/Misc/Tree.thy
author wenzelm
Mon, 12 Nov 2001 23:28:49 +0100
changeset 12167 74f92a43bac3
parent 5377 efb799c5ed3c
permissions -rw-r--r--
empty rule_context for multiple goals;

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