Theorem iseqsetvlem

Description: Lemma for iseqsetv-cleq . (Contributed by Wolf Lammen, 17-Aug-2025) (Proof modification is discouraged.)

	Ref	Expression
Assertion	iseqsetvlem	$$⊢\exists xx=A\leftrightarrow \exists zz=A$$

Proof

Step	Hyp	Ref	Expression
1		eqeq1	$$⊢x=z\to \left(x=A\leftrightarrow z=A\right)$$
2	1	cbvexvw	$$⊢\exists xx=A\leftrightarrow \exists zz=A$$