Theorem mt2 ≪ | index | src | ≫

theorem mt2 (a b: wff): $ b -> ~a $ > $ a $ > $ ~b $;

Step	Hyp	Ref	Expression
1		con2	(b -> ~a) -> a -> ~b
2		hyp h1	b -> ~a
3	1, 2	ax_mp	a -> ~b
4		hyp h2	a
5	3, 4	ax_mp	~b

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)