Theorem vprcOLD

Description: Obsolete proof of vprc , obsolete as of 1-May-2026. (Contributed by NM, 23-Aug-1993) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	vprcOLD	$$⊢\neg \mathrm{V}\in \mathrm{V}$$

Proof

Step	Hyp	Ref	Expression
1		vnex	$$⊢\neg \exists xx=\mathrm{V}$$
2		isset	$$⊢\mathrm{V}\in \mathrm{V}\leftrightarrow \exists xx=\mathrm{V}$$
3	1 2	mtbir	$$⊢\neg \mathrm{V}\in \mathrm{V}$$