Theorem ral0OLD

Description: Obsolete version of ral0 as of 2-Sep-2024. (Contributed by NM, 20-Oct-2005) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Assertion	ral0OLD	⊢ ∀ 𝑥 ∈ ∅ 𝜑

Proof

Step	Hyp	Ref	Expression
1		noel	⊢ ¬ 𝑥 ∈ ∅
2	1	pm2.21i	⊢ ( 𝑥 ∈ ∅ → 𝜑 )
3	2	rgen	⊢ ∀ 𝑥 ∈ ∅ 𝜑