eqt>p

Theorem.

Arguments:

(obj), (obj), (obj),

Assertions:

(()(()()))

Proof:

Hyp	Ref	Line	Expr
	eqt>n	1	(()(()()))
	eqt>	2	(()(()()))
1, 2	bi.bldan<>d	3	(()((()())(()())))
	df-psub	4	(()(()()))
	df-psub	5	(()(()()))
3, 4, 5	<2bitrg	6	(()(()()))