Theorem nfdiOLD 2225

Description: Obsolete proof of nf5di 2119 as of 6-Oct-2021. (Contributed by NM, 17-Aug-2018.) (Proof shortened by Wolf Lammen, 10-Jul-2019.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypothesis

Ref	Expression
nfdiOLD.1	|- ( ph -> F/ x ph )

Assertion

Ref	Expression
nfdiOLD	|- F/ x ph

Proof of Theorem nfdiOLD

Step	Hyp	Ref	Expression
1		nfdiOLD.1	. . . 4 |- ( ph -> F/ x ph )
2	1	nfrdOLD 2190	. . 3 |- ( ph -> ( ph -> A. x ph ) )
3	2	pm2.43i 52	. 2 |- ( ph -> A. x ph )
4	3	nfiOLD 1734	1 |- F/ x ph

Syntax hints:   -> wi 4   A.wal 1481   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-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-12 2047

This theorem depends on definitions:  df-bi 197  df-ex 1705  df-nfOLD 1721

This theorem is referenced by: (None)