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

Step	Hyp	Ref	Expression
1		anr	a /\ b -> b
2		anl	a /\ b -> a
3	1, 2	iand	a /\ b -> b /\ a

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)