Theorem exim1 ≪ | index | src | ≫

theorem exim1 {x: nat} (a: wff) (b: wff x): $ E. x (a -> b) -> a -> E. x b $;

Step	Hyp	Ref	Expression
1		mpcom	a -> (a -> b) -> b
2	1	eximd	a -> E. x (a -> b) -> E. x b
3	2	com12	E. x (a -> b) -> a -> E. x b

Axiom use

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