Theorem anr ≪ | index | src | ≫ 

theorem anr (a b: wff): $ a /\ b -> b $;
StepHypRefExpression
1 con1 
(~b -> a -> ~b) -> ~(a -> ~b) -> b
2 1 conv an 
(~b -> a -> ~b) -> a /\ b -> b
3 ax_1 
~b -> a -> ~b
4 2, 3 ax_mp 
a /\ b -> b

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)