Theorem ssid ≪ | index | src | ≫

theorem ssid (A: set): $ A C_ A $;

Step	Hyp	Ref	Expression
1		id	x e. A -> x e. A
2	1	ax_gen	A. x (x e. A -> x e. A)
3	2	conv subset	A C_ A

Axiom use

axs_prop_calc (ax_1, ax_2, ax_mp), axs_pred_calc (ax_gen)