Theorem nfrab1 2714

Description: The abstraction variable in a restricted class abstraction isn't free. (Contributed by NM, 19-Mar-1997.)

Assertion

Ref	Expression
nfrab1	⊢ Ⅎ𝑥{𝑥 ∈ 𝐴 ∣ 𝜑}

Proof of Theorem nfrab1

Step	Hyp	Ref	Expression
1		df-rab 2520	. 2 ⊢ {𝑥 ∈ 𝐴 ∣ 𝜑} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)}
2		nfab1 2377	. 2 ⊢ Ⅎ𝑥{𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)}
3	1, 2	nfcxfr 2372	1 ⊢ Ⅎ𝑥{𝑥 ∈ 𝐴 ∣ 𝜑}

Syntax hints:   ∧ wa 104   ∈ wcel 2202  {cab 2217  Ⅎwnfc 2362  {crab 2515

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1496  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-11 1555  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-rab 2520

This theorem is referenced by:  repizf2  4258  rabxfrd  4572  onintrab2im  4622  tfis  4687  fvmptssdm  5740  infssuzcldc  10541  nnwosdc  12673  imasnopn  15093  lfgrnloopen  16057