Theorem ancomb ≪ | index | src | ≫

theorem ancomb (a b: wff): $ a /\ b <-> b /\ a $;

Step	Hyp	Ref	Expression
1		ancom	a /\ b -> b /\ a
2		ancom	b /\ a -> a /\ b
3	1, 2	ibii	a /\ b <-> b /\ a

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)