Theorem nfe2

Description: An inner existential quantifier's variable is bound. (Contributed by SN, 11-Feb-2026)

	Ref	Expression
Assertion	nfe2	$$⊢Ⅎx\exists y\exists x\phi$$

Proof

Step	Hyp	Ref	Expression
1		excom	$$⊢\exists y\exists x\phi \leftrightarrow \exists x\exists y\phi$$
2		nfe1	$$⊢Ⅎx\exists x\exists y\phi$$
3	1 2	nfxfr	$$⊢Ⅎx\exists y\exists x\phi$$