bi.bldbi>d

Theorem.

Arguments:

(pr), (pr), (pr), (pr),

Hypotheses:

(())

Assertions:

((()()))

Proof:

Hyp	Ref	Line	Expr
	Hypo	1	(())
1	bi.bldim>d	2	((()()))
2	bi.bldan<d	3	(((()())(()())))
1	bi.bldim<d	4	((()()))
4	bi.bldan>d	5	(((()())(()())))
3, 5	bitrd	6	(((()())(()())))
	dfbi	7	(()(()()))
	dfbi	8	(()(()()))
6, 7, 8	<2bitrg	9	((()()))