Theorem eqcomi ≪ | index | src | ≫ 

theorem eqcomi (a b: nat): $ a = b $ > $ b = a $;
StepHypRefExpression
1 eqcom 
a = b -> b = a
2 hyp h 
a = b
3 1, 2 ax_mp 
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)