Theorem anri ≪ | index | src | ≫ 

theorem anri (a b: wff): $ a /\ b $ > $ b $;
StepHypRefExpression
1 anr 
a /\ b -> b
2 hyp h 
a /\ b
3 1, 2 ax_mp 
b

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)