Theorem mpi ≪ | index | src | ≫

theorem mpi (a b c: wff): $ b $ > $ a -> b -> c $ > $ a -> c $;

Step	Hyp	Ref	Expression
1		hyp h1	b
2	1	a1i	a -> b
3		hyp h2	a -> b -> c
4	2, 3	mpd	a -> c

Axiom use

axs_prop_calc (ax_1, ax_2, ax_mp)