bi.bldor<>

Theorem.

Arguments:

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

Hypotheses:

()

()

Assertions:

(()())

Proof:

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