Theorem expcom ≪ | index | src | ≫

theorem expcom (a b c: wff): $ a /\ b -> c $ > $ b -> a -> c $;

Step	Hyp	Ref	Expression
1		hyp h	a /\ b -> c
2	1	exp	a -> b -> c
3	2	com12	b -> a -> c

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)