Theorem exbiii

Description: Inference associated with exbii . Weaker version of eximii . (Contributed by SN, 14-Oct-2025)

	Ref	Expression
Hypotheses	exbiii.1	|- E. x ph
	exbiii.2	|- ( ph <-> ps )
Assertion	exbiii	|- E. x ps

Proof

Step	Hyp	Ref	Expression
1		exbiii.1	|- E. x ph
2		exbiii.2	|- ( ph <-> ps )
3	2	biimpi	|- ( ph -> ps )
4	1 3	eximii	|- E. x ps