bi.bldor>

Theorem.

Arguments:

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

Hypotheses:

()

Assertions:

(()())

Proof:

Hyp	Ref	Line	Expr
	Hypo	1	()
1	bi.bldim>	2	(()())
	df-or	3	(()())
	df-or	4	(()())
2, 3, 4	<2bitr	5	(()())