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Theorem nfop 4847
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 4828 . 2 𝐴, 𝐵⟩ = if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
2 nfop.1 . . . . 5 𝑥𝐴
32nfel1 2940 . . . 4 𝑥 𝐴 ∈ V
4 nfop.2 . . . . 5 𝑥𝐵
54nfel1 2940 . . . 4 𝑥 𝐵 ∈ V
63, 5nfan 1919 . . 3 𝑥(𝐴 ∈ V ∧ 𝐵 ∈ V)
72nfsn 4666 . . . 4 𝑥{𝐴}
82, 4nfpr 4651 . . . 4 𝑥{𝐴, 𝐵}
97, 8nfpr 4651 . . 3 𝑥{{𝐴}, {𝐴, 𝐵}}
10 nfcv 2924 . . 3 𝑥
116, 9, 10nfif 4511 . 2 𝑥if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
121, 11nfcxfr 2922 1 𝑥𝐴, 𝐵
Colors of variables: wff setvar class
Syntax hints:  wa 399  wcel 2142  wnfc 2909  Vcvv 3454  c0 4285  ifcif 4480  {csn 4582  {cpr 4584  cop 4588
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-nf 1804  df-sb 2091  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-v 3456  df-dif 3907  df-un 3909  df-ss 3921  df-nul 4286  df-if 4481  df-sn 4583  df-pr 4585  df-op 4589
This theorem is referenced by:  nfopd  4848  moop2  5471  iunopeqop  5490  iunopeqopOLD  5491  fliftfuns  7298  dfmpo  8081  qliftfuns  8786  xpf1o  9111  nfseq  14024  txcnp  23680  cnmpt1t  23725  cnmpt2t  23733  flfcnp2  24067  nosupbnd2  27780  noinfbnd2  27795  nfseqs  28380  bnj958  35235  bnj1000  35236  bnj1446  35340  bnj1447  35341  bnj1448  35342  bnj1466  35348  bnj1467  35349  bnj1519  35360  bnj1520  35361  bnj1529  35365  poimirlem26  38145  nfopdALT  39595  nfaov  47773
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