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Theorem nfa1OLD 2305
Description: Obsolete proof of nfa1 2178 as of 12-Oct-2021. (Contributed by Mario Carneiro, 11-Aug-2016.) df-nf 1859 changed. (Revised by Wolf Lammen, 11-Sep-2021.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
nfa1OLD 𝑥𝑥𝜑

Proof of Theorem nfa1OLD
StepHypRef Expression
1 hba1 2299 . 2 (∀𝑥𝜑 → ∀𝑥𝑥𝜑)
21nf5i 2174 1 𝑥𝑥𝜑
Colors of variables: wff setvar class
Syntax hints:  wal 1630  wnf 1857
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1989  ax-6 2055  ax-7 2091  ax-10 2169  ax-12 2197
This theorem depends on definitions:  df-bi 197  df-or 384  df-ex 1854  df-nf 1859
This theorem is referenced by: (None)
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