Theorem eale ≪ | index | src | ≫

theorem eale {x: nat} (a: nat) (b: wff x) (c: wff):
  $ 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	ealeh	A. x b -> c

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp), axs_pred_calc (ax_gen, ax_4, ax_5, ax_6, ax_7, ax_10, ax_12)