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Theorem nfa2 1559
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 1522 . 2 𝑥𝑥𝜑
21nfal 1556 1 𝑥𝑦𝑥𝜑
Colors of variables: wff set class
Syntax hints:  wal 1330  wnf 1437
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 1424  ax-7 1425  ax-gen 1426  ax-4 1488  ax-ial 1515
This theorem depends on definitions:  df-bi 116  df-nf 1438
This theorem is referenced by:  cbv1h  1724  csbie2t  3053  copsex2t  4175  fnoprabg  5880
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