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theorem iani (a b: wff): $ a $ > $ b $ > $ a /\ b $;
StepHypRefExpression
1 ian 
a -> b -> a /\ b
2 hyp h1 
a
3 1, 2 ax_mp 
b -> a /\ b
4 hyp h2 
b
5 3, 4 ax_mp 
a /\ b

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)