Theorem ealie ≪ | index | src | ≫

theorem ealie (c: wff) {x: nat} (a: nat) (b: wff x):
  $ x = a -> b -> c $ >
  $ A. x b -> c $;

Step	Hyp	Ref	Expression
1		nfv	F/ x c
2		hyp e	x = a -> b -> c
3	1, 2	ealieh	A. x b -> c

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_12)