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Theorem nfop 4851
Description: Bound-variable hypothesis builder for ordered pairs. (Contributed by NM, 14-Nov-1995.)
Hypotheses
Ref Expression
nfop.1 𝑥𝐴
nfop.2 𝑥𝐵
Assertion
Ref Expression
nfop 𝑥𝐴, 𝐵

Proof of Theorem nfop
StepHypRef Expression
1 dfopif 4832 . 2 𝐴, 𝐵⟩ = if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
2 nfop.1 . . . . 5 𝑥𝐴
32nfel1 2918 . . . 4 𝑥 𝐴 ∈ V
4 nfop.2 . . . . 5 𝑥𝐵
54nfel1 2918 . . . 4 𝑥 𝐵 ∈ V
63, 5nfan 1902 . . 3 𝑥(𝐴 ∈ V ∧ 𝐵 ∈ V)
72nfsn 4673 . . . 4 𝑥{𝐴}
82, 4nfpr 4656 . . . 4 𝑥{𝐴, 𝐵}
97, 8nfpr 4656 . . 3 𝑥{{𝐴}, {𝐴, 𝐵}}
10 nfcv 2902 . . 3 𝑥
116, 9, 10nfif 4521 . 2 𝑥if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
121, 11nfcxfr 2900 1 𝑥𝐴, 𝐵
Colors of variables: wff setvar class
Syntax hints:  wa 396  wcel 2106  wnfc 2882  Vcvv 3446  c0 4287  ifcif 4491  {csn 4591  {cpr 4593  cop 4597
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2702
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-clab 2709  df-cleq 2723  df-clel 2809  df-nfc 2884  df-v 3448  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4288  df-if 4492  df-sn 4592  df-pr 4594  df-op 4598
This theorem is referenced by:  nfopd  4852  moop2  5464  iunopeqop  5483  fliftfuns  7264  dfmpo  8039  qliftfuns  8750  xpf1o  9090  nfseq  13926  txcnp  23008  cnmpt1t  23053  cnmpt2t  23061  flfcnp2  23395  nosupbnd2  27101  noinfbnd2  27116  bnj958  33641  bnj1000  33642  bnj1446  33746  bnj1447  33747  bnj1448  33748  bnj1466  33754  bnj1467  33755  bnj1519  33766  bnj1520  33767  bnj1529  33771  poimirlem26  36177  nfopdALT  37506  nfaov  45531
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