Theorem ialdh ≪ | index | src | ≫

theorem ialdh {x: nat} (a b: wff x): $ F/ x a $ > $ a -> b $ > $ a -> A. x b $;

Step	Hyp	Ref	Expression
1		hyp h2	a -> b
2	1	alimi	A. x a -> A. x b
3		hyp h1	F/ x a
4	3	nfi	a -> A. x a
5	2, 4	syl	a -> A. x b

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_12)