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Theorem nfa2 1572
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 1534 . 2 𝑥𝑥𝜑
21nfal 1569 1 𝑥𝑦𝑥𝜑
Colors of variables: wff set class
Syntax hints:  wal 1346  wnf 1453
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ial 1527
This theorem depends on definitions:  df-bi 116  df-nf 1454
This theorem is referenced by:  cbv1h  1739  csbie2t  3097  copsex2t  4230  fnoprabg  5954
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