Theorem mpcom ≪ | index | src | ≫

theorem mpcom (a b: wff): $ a -> (a -> b) -> b $;

Step	Hyp	Ref	Expression
1		id	(a -> b) -> a -> b
2	1	com12	a -> (a -> b) -> b

Axiom use

axs_prop_calc (ax_1, ax_2, ax_mp)