Theorem dvdmul1 ≪ | index | src | ≫ 

theorem dvdmul1 (a b: nat): $ a || b * a $;
StepHypRefExpression
1 idvd 
b * a = b * a -> a || b * a
2 eqid 
b * a = b * a
3 1, 2 ax_mp 
a || b * a

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp), axs_pred_calc (ax_gen, ax_4, ax_5, ax_6, ax_7, ax_12), axs_peano (muleq)