Theorem natle1 | index | src |

theorem natle1 (p: wff): $ nat p <= 1 $;
StepHypRefExpression
1 boolle1
bool (nat p) <-> nat p <= 1
2 boolnat
bool (nat p)
3 1, 2 mpbi
nat p <= 1

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_set (elab, ax_8), axs_the (theid), axs_peano (peano1, peano2, peano5, addeq, add0, addS)