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Theorem nfop 4858
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 4839 . 2 𝐴, 𝐵⟩ = if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
2 nfop.1 . . . . 5 𝑥𝐴
32nfel1 2947 . . . 4 𝑥 𝐴 ∈ V
4 nfop.2 . . . . 5 𝑥𝐵
54nfel1 2947 . . . 4 𝑥 𝐵 ∈ V
63, 5nfan 1926 . . 3 𝑥(𝐴 ∈ V ∧ 𝐵 ∈ V)
72nfsn 4678 . . . 4 𝑥{𝐴}
82, 4nfpr 4663 . . . 4 𝑥{𝐴, 𝐵}
97, 8nfpr 4663 . . 3 𝑥{{𝐴}, {𝐴, 𝐵}}
10 nfcv 2931 . . 3 𝑥
116, 9, 10nfif 4523 . 2 𝑥if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
121, 11nfcxfr 2929 1 𝑥𝐴, 𝐵
Colors of variables: wff setvar class
Syntax hints:  wa 400  wcel 2149  wnfc 2916  Vcvv 3463  c0 4294  ifcif 4492  {csn 4594  {cpr 4596  cop 4600
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-v 3465  df-dif 3916  df-un 3918  df-ss 3930  df-nul 4295  df-if 4493  df-sn 4595  df-pr 4597  df-op 4601
This theorem is referenced by:  nfopd  4859  moop2  5486  iunopeqop  5505  iunopeqopOLD  5506  fliftfuns  7313  dfmpo  8097  qliftfuns  8802  xpf1o  9127  nfseq  14047  txcnp  23746  cnmpt1t  23791  cnmpt2t  23799  flfcnp2  24133  nosupbnd2  27846  noinfbnd2  27861  nfseqs  28446  bnj958  35273  bnj1000  35274  bnj1446  35378  bnj1447  35379  bnj1448  35380  bnj1466  35386  bnj1467  35387  bnj1519  35398  bnj1520  35399  bnj1529  35403  poimirlem26  38185  nfopdALT  39635  nfaov  47805
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