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Theorem nfa2 1471
Description: Lemma 24 of [Monk2] p. 114. (Contributed by Mario Carneiro, 24-Sep-2016.)
Assertion
Ref Expression
nfa2 𝑥𝑦𝑥𝜑

Proof of Theorem nfa2
StepHypRef Expression
1 nfa1 1434 . 2 𝑥𝑥𝜑
21nfal 1468 1 𝑥𝑦𝑥𝜑
Colors of variables: wff set class
Syntax hints:  wal 1241  wnf 1349
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-5 1336  ax-7 1337  ax-gen 1338  ax-4 1400  ax-ial 1427
This theorem depends on definitions:  df-bi 110  df-nf 1350
This theorem is referenced by:  cbv1h  1633  csbie2t  2894  copsex2t  3982  fnoprabg  5602  strcollnft  10109
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