Who Cites node?
node	Def tree_node(<x, y>) == tree_node(<x,y>)
	Thm* E:Type, x,y:Tree(E). tree_node(<x, y>)  Tree(E)
tree_node	Def tree_node(x) == inr(x)
	Thm* E,T:Type, x:(TT). tree_node(x)  tree_con(E;T)
	Thm* E:Type, x,y:Tree(E). tree_node(<x,y>)  Tree(E)

Syntax:

tree_node(<x, y>)

has structure:

node(x; y)

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