Theorem nfdm ≪ | index | src | ≫

theorem nfdm {x: nat} (A: set x): $ FS/ x A $ > $ FS/ x Dom A $;

Step	Hyp	Ref	Expression
1		hyp h	FS/ x A
2	1	nfel2	F/ x a1, a2 e. A
3	2	nfex	F/ x E. a2 a1, a2 e. A
4	3	nfab	FS/ x {a1 \| E. a2 a1, a2 e. A}
5	4	conv Dom	FS/ x Dom A

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_11, ax_12), axs_set (elab, ax_8)