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Theorem bj-nfalt 32702
Description: Closed form of nfal 2153. (Contributed by BJ, 2-May-2019.)
Assertion
Ref Expression
bj-nfalt  |-  ( A. x F/ y ph  ->  F/ y A. x ph )

Proof of Theorem bj-nfalt
StepHypRef Expression
1 bj-hbalt 32671 . . . 4  |-  ( A. x ( ph  ->  A. y ph )  -> 
( A. x ph  ->  A. y A. x ph ) )
21alimi 1739 . . 3  |-  ( A. y A. x ( ph  ->  A. y ph )  ->  A. y ( A. x ph  ->  A. y A. x ph ) )
32alcoms 2035 . 2  |-  ( A. x A. y ( ph  ->  A. y ph )  ->  A. y ( A. x ph  ->  A. y A. x ph ) )
4 nf5 2116 . . 3  |-  ( F/ y ph  <->  A. y
( ph  ->  A. y ph ) )
54albii 1747 . 2  |-  ( A. x F/ y ph  <->  A. x A. y ( ph  ->  A. y ph ) )
6 nf5 2116 . 2  |-  ( F/ y A. x ph  <->  A. y ( A. x ph  ->  A. y A. x ph ) )
73, 5, 63imtr4i 281 1  |-  ( A. x F/ y ph  ->  F/ y A. x ph )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4   A.wal 1481   F/wnf 1708
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-10 2019  ax-11 2034  ax-12 2047
This theorem depends on definitions:  df-bi 197  df-or 385  df-ex 1705  df-nf 1710
This theorem is referenced by:  bj-dvelimdv1  32835
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