Theorem isseti

Description: A way to say " A is a set" (inference form). (Contributed by NM, 24-Jun-1993) Remove dependencies on axioms. (Revised by BJ, 13-Jul-2019)

	Ref	Expression
Hypothesis	isseti.1	$$⊢A\in \mathrm{V}$$
Assertion	isseti	$$⊢\exists xx=A$$

Proof

Step	Hyp	Ref	Expression
1		isseti.1	$$⊢A\in \mathrm{V}$$
2		elisset	$$⊢A\in \mathrm{V}\to \exists xx=A$$
3	1 2	ax-mp	$$⊢\exists xx=A$$