syl

Theorem. An inference version of the transitive laws for implication.

Arguments:

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

Hypotheses:

()

()

Assertions:

()

Proof:

Hyp	Ref	Line	Expr
	Hypo	1	()
		2	()
1	ax1	3	(())
3	ax2	4	(()())
2, 4	ax-mp	5	()