Theorem sndleid | index | src |

theorem sndleid (a: nat): $ snd a <= a $;
StepHypRefExpression
1 leeq2
fst a, snd a = a -> (snd a <= fst a, snd a <-> snd a <= a)
2 fstsnd
fst a, snd a = a
3 1, 2 ax_mp
snd a <= fst a, snd a <-> snd a <= a
4 leprid2
snd a <= fst a, snd a
5 3, 4 mpbi
snd a <= 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_set (elab, ax_8), axs_the (theid, the0), axs_peano (peano1, peano2, peano5, addeq, muleq, add0, addS, mul0, mulS)