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Theorem nfa2 1744
Description: Lemma 24 of [Monk2] p. 114. (Contributed by Mario Carneiro, 24-Sep-2016.)
Assertion
Ref Expression
nfa2  |-  F/ x A. y A. x ph

Proof of Theorem nfa2
StepHypRef Expression
1 nfa1 1719 . 2  |-  F/ x A. x ph
21nfal 1732 1  |-  F/ x A. y A. x ph
Colors of variables: wff set class
Syntax hints:   A.wal 1532   F/wnf 1539
This theorem is referenced by:  mo  2138  csbie2t  3067  copsex2t  4190  fnoprabg  5844  pm14.123b  26959  hbexg  27338
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10  ax-5 1533  ax-6 1534  ax-7 1535  ax-gen 1536  ax-4 1692
This theorem depends on definitions:  df-bi 179  df-nf 1540
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