Theorem preq1d ≪ | index | src | ≫ 

theorem preq1d (_G: wff) (_a1 _a2 b: nat):
  $ _G -> _a1 = _a2 $ >
  $ _G -> _a1, b = _a2, b $;
StepHypRefExpression
1 hyp _h 
_G -> _a1 = _a2
2 eqidd 
_G -> b = b
3 1, 2 preqd 
_G -> _a1, b = _a2, b

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 (peano2, addeq, muleq)