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Theorem nfra1 2581
Description: 𝑥 is not free in ∀𝑥 ∈ 𝐴𝜑. (Contributed by NM, 18-Oct-1996.) (Revised by Mario Carneiro, 7-Oct-2016.)
Assertion
Ref Expression
nfra1 Ⅎ𝑥∀𝑥 ∈ 𝐴 𝜑

Proof of Theorem nfra1
StepHypRef Expression
1 df-ral 2533 . 2 (∀𝑥 ∈ 𝐴 𝜑 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝜑))
2 nfa1 1594 . 2 Ⅎ𝑥∀𝑥(𝑥 ∈ 𝐴 → 𝜑)
31, 2nfxfr 1527 1 Ⅎ𝑥∀𝑥 ∈ 𝐴 𝜑
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4  ∀wal 1400  Ⅎwnf 1513   ∈ wcel 2209  ∀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  4211  reusv1  4604  ralxfrALT  4613  peano2  4742  fun11iun  5660  fvmptssdm  5790  ffnfv  5866  riota5f  6065  mpoeq123  6147  abrexss  6358  tfri3  6638  nfixp1  7000  nneneq  7158  exmidomni  7483  mkvprop  7499  caucvgsrlemgt1  8163  suplocsrlem  8176  lble  9280  indstr  10003  zsupcllemstep  10673  nninfinf  10895  fimaxre2  12010  prodeq2  12343  bezoutlemmain  12794  bezoutlemzz  12798  exmidunben  13369  mulcncf  15800  limccnp2cntop  15869  bj-rspgt  16980  isomninnlem  17245  iswomninnlem  17266  ismkvnnlem  17269
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