Theorem lt01S ≪ | index | src | ≫ 

theorem lt01S (a: nat): $ 0 < suc a $;
StepHypRefExpression
1 lt01 
0 < suc a <-> suc a != 0
2 peano1 
suc a != 0
3 1, 2 mpbir 
0 < suc a

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp, itru), axs_pred_calc (ax_gen, ax_4, ax_5, ax_6, ax_7, ax_10, ax_11, ax_12), axs_peano (peano1, peano2, peano5, addeq, add0, addS)