Theorem pncan | index | src |

theorem pncan (a b: nat): $ a + b - b = a $;
StepHypRefExpression
1 eqsub1
a + b = a + b -> a + b - b = a
2 eqid
a + b = a + b
3 1, 2 ax_mp
a + b - b = 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), axs_peano (peano2, peano5, addeq, add0, addS)