bi.bldan<

Theorem.

Arguments:

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

Hypotheses:

()

Assertions:

(()())

Proof:

Hyp	Ref	Line	Expr
	Hypo	1	()
	ancom	2	(()())
1	bi.bldan>	3	(()())
	ancom	4	(()())
2, 3, 4	2bitr	5	(()())