im.an

Theorem.

Arguments:

(pr), (pr),

Assertions:

(()())

Proof:

Hyp	Ref	Line	Expr
	bneg>	1	()
1	bi.bldim>	2	(()())
	df-an	3	(()())
3	conb>i	4	(()())
2, 4	bitr	5	(()())