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Theorem nfa2 1512
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 1475 . 2 𝑥𝑥𝜑
21nfal 1509 1 𝑥𝑦𝑥𝜑
Colors of variables: wff set class
Syntax hints:  wal 1283  wnf 1390
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1377  ax-7 1378  ax-gen 1379  ax-4 1441  ax-ial 1468
This theorem depends on definitions:  df-bi 115  df-nf 1391
This theorem is referenced by:  cbv1h  1675  csbie2t  2959  copsex2t  4028  fnoprabg  5653  strcollnft  11046
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