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

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

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)