Theorem nfvdOLD 1872

Description: Obsolete proof of nfvd 1844 as of 6-Oct-2021. (Contributed by Mario Carneiro, 6-Oct-2016.) (New usage is discouraged.) (Proof modification is discouraged.)

Assertion

Ref	Expression
nfvdOLD	|- ( ph -> F/ x ps )

Distinct variable group:   ps, x

Allowed substitution hint:   ph( x)

Proof of Theorem nfvdOLD

Step	Hyp	Ref	Expression
1		nfvOLD 1871	. 2 |- F/ x ps
2	1	a1i 11	1 |- ( ph -> F/ x ps )

Syntax hints:   -> wi 4   F/wnfOLD 1709

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-5 1839

This theorem depends on definitions:  df-bi 197  df-nfOLD 1721

This theorem is referenced by: (None)