Theorem anl ≪ | index | src | ≫ 

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

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp)