Theorem ex202 | index | src |

theorem ex202 (R: set) (l: nat): $ ~l, 0 e. ex2 R $;
StepHypRefExpression
1 ex2com
0, l e. ex2 (cnv R) <-> l, 0 e. ex2 R
2 ex201
~0, l e. ex2 (cnv R)
3 1, 2 mtbi
~l, 0 e. ex2 R

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)