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Theorem nfra1 2581
Description:  x is not free in  A. x  e.  A ph. (Contributed by NM, 18-Oct-1996.) (Revised by Mario Carneiro, 7-Oct-2016.)
Assertion
Ref Expression
nfra1  |-  F/ x A. x  e.  A  ph

Proof of Theorem nfra1
StepHypRef Expression
1 df-ral 2533 . 2  |-  ( A. x  e.  A  ph  <->  A. x
( x  e.  A  ->  ph ) )
2 nfa1 1594 . 2  |-  F/ x A. x ( x  e.  A  ->  ph )
31, 2nfxfr 1527 1  |-  F/ x A. x  e.  A  ph
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4   A.wal 1400   F/wnf 1513    e. wcel 2209   A.wral 2528
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-gen 1502  ax-ial 1587
This proof depends on definitions:  df-bi 117  df-nf 1514  df-ral 2533
This theorem is used by:  nfra2xy  2592  r19.12  2657  ralbi  2683  rexbi  2684  nfss  3241  ralidm  3628  nfii1  4043  dfiun2g  4044  mpteq12f  4212  reusv1  4606  ralxfrALT  4615  peano2  4744  fun11iun  5663  fvmptssdm  5793  ffnfv  5869  riota5f  6068  mpoeq123  6150  abrexss  6362  tfri3  6642  nfixp1  7004  nneneq  7162  exmidomni  7488  mkvprop  7504  caucvgsrlemgt1  8168  suplocsrlem  8181  lble  9285  indstr  10009  zsupcllemstep  10679  nninfinf  10901  fimaxre2  12016  prodeq2  12349  bezoutlemmain  12800  bezoutlemzz  12804  exmidunben  13375  mulcncf  15834  limccnp2cntop  15903  bj-rspgt  17019  isomninnlem  17285  iswomninnlem  17306  ismkvnnlem  17309
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