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Theorem nfop 4854
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 4835 . 2 𝐴, 𝐵⟩ = if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
2 nfop.1 . . . . 5 𝑥𝐴
32nfel1 2941 . . . 4 𝑥 𝐴 ∈ V
4 nfop.2 . . . . 5 𝑥𝐵
54nfel1 2941 . . . 4 𝑥 𝐵 ∈ V
63, 5nfan 1929 . . 3 𝑥(𝐴 ∈ V ∧ 𝐵 ∈ V)
72nfsn 4673 . . . 4 𝑥{𝐴}
82, 4nfpr 4658 . . . 4 𝑥{𝐴, 𝐵}
97, 8nfpr 4658 . . 3 𝑥{{𝐴}, {𝐴, 𝐵}}
10 nfcv 2925 . . 3 𝑥
116, 9, 10nfif 4518 . 2 𝑥if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
121, 11nfcxfr 2923 1 𝑥𝐴, 𝐵
Colors of variables: wff setvar class
Syntax hints:  wa 400  wcel 2143  wnfc 2910  Vcvv 3455  c0 4286  ifcif 4487  {csn 4589  {cpr 4591  cop 4595
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-v 3457  df-dif 3908  df-un 3910  df-ss 3922  df-nul 4287  df-if 4488  df-sn 4590  df-pr 4592  df-op 4596
This theorem is referenced by:  nfopd  4855  moop2  5485  iunopeqop  5504  iunopeqopOLD  5505  fliftfuns  7312  dfmpo  8093  qliftfuns  8798  xpf1o  9123  nfseq  14043  txcnp  23777  cnmpt1t  23822  cnmpt2t  23830  flfcnp2  24164  nosupbnd2  27880  noinfbnd2  27895  nfseqs  28480  bnj958  35328  bnj1000  35329  bnj1446  35433  bnj1447  35434  bnj1448  35435  bnj1466  35441  bnj1467  35442  bnj1519  35453  bnj1520  35454  bnj1529  35458  poimirlem26  38317  nfopdALT  39765  nfaov  47936
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