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Theorem nfa2 1860
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 1789 . 2  |-  F/ x A. x ph
21nfal 1847 1  |-  F/ x A. y A. x ph
Colors of variables: wff set class
Syntax hints:   A.wal 1540   F/wnf 1544
This theorem is referenced by:  mo  2231  csbie2t  3201  copsex2t  4335  fnoprabg  6032  pm14.123b  26949  hbexg  28067
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746
This theorem depends on definitions:  df-bi 177  df-ex 1542  df-nf 1545
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