Theorem nfvdOLD 1859

Description: Obsolete proof of nfvd 1831 as of 6-Oct-2021. (Contributed by Mario Carneiro, 6-Oct-2016.) (New usage is discouraged.) (Proof modification is discouraged.)

Assertion

Ref	Expression
nfvdOLD	⊢ (𝜑 → Ⅎ𝑥𝜓)

Distinct variable group:   𝜓,𝑥

Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem nfvdOLD

Step	Hyp	Ref	Expression
1		nfvOLD 1858	. 2 ⊢ Ⅎ𝑥𝜓
2	1	a1i 11	1 ⊢ (𝜑 → Ⅎ𝑥𝜓)

Syntax hints:   → wi 4  ℲwnfOLD 1700

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-5 1827

This theorem depends on definitions:  df-bi 196  df-nfOLD 1712

This theorem is referenced by: (None)