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theorem eqscom (A B: set): $ A == B -> B == A $;

Step	Hyp	Ref	Expression
1		bicom	(x e. A <-> x e. B) -> (x e. B <-> x e. A)
2	1	alimi	A. x (x e. A <-> x e. B) -> A. x (x e. B <-> x e. A)
3	2	conv eqs	A == B -> B == A

Axiom use

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