Theorem preq2d ≪ | index | src | ≫

theorem preq2d (_G: wff) (a _b1 _b2: nat):
  $ _G -> _b1 = _b2 $ >
  $ _G -> a, _b1 = a, _b2 $;

Step	Hyp	Ref	Expression
1		eqidd	_G -> a = a
2		hyp _h	_G -> _b1 = _b2
3	1, 2	preqd	_G -> a, _b1 = a, _b2

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)