Theorem birexan2i ≪ | index | src | ≫

theorem birexan2i (a: wff) {x: nat} (p b c: wff x):
  $ b <-> E. x (p /\ c) $ >
  $ a /\ b <-> E. x (p /\ (a /\ c)) $;

Step	Hyp	Ref	Expression
1		hyp h	b <-> E. x (p /\ c)
2	1	a1i	a -> (b <-> E. x (p /\ c))
3	2	birexan2a	a /\ b <-> E. x (p /\ (a /\ c))

Axiom use

axs_prop_calc (ax_1, ax_2, ax_3, ax_mp), axs_pred_calc (ax_gen, ax_4, ax_5)