MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  nfop Structured version   Visualization version   GIF version

Theorem nfop 4822
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 4803 . 2 𝐴, 𝐵⟩ = if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
2 nfop.1 . . . . 5 𝑥𝐴
32nfel1 2997 . . . 4 𝑥 𝐴 ∈ V
4 nfop.2 . . . . 5 𝑥𝐵
54nfel1 2997 . . . 4 𝑥 𝐵 ∈ V
63, 5nfan 1899 . . 3 𝑥(𝐴 ∈ V ∧ 𝐵 ∈ V)
72nfsn 4646 . . . 4 𝑥{𝐴}
82, 4nfpr 4631 . . . 4 𝑥{𝐴, 𝐵}
97, 8nfpr 4631 . . 3 𝑥{{𝐴}, {𝐴, 𝐵}}
10 nfcv 2980 . . 3 𝑥
116, 9, 10nfif 4499 . 2 𝑥if((𝐴 ∈ V ∧ 𝐵 ∈ V), {{𝐴}, {𝐴, 𝐵}}, ∅)
121, 11nfcxfr 2978 1 𝑥𝐴, 𝐵
Colors of variables: wff setvar class
Syntax hints:  wa 398  wcel 2113  wnfc 2964  Vcvv 3497  c0 4294  ifcif 4470  {csn 4570  {cpr 4572  cop 4576
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2796
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2966  df-v 3499  df-dif 3942  df-un 3944  df-in 3946  df-ss 3955  df-nul 4295  df-if 4471  df-sn 4571  df-pr 4573  df-op 4577
This theorem is referenced by:  nfopd  4823  moop2  5395  iunopeqop  5414  fliftfuns  7070  dfmpo  7800  qliftfuns  8387  xpf1o  8682  nfseq  13382  txcnp  22231  cnmpt1t  22276  cnmpt2t  22284  flfcnp2  22618  bnj958  32216  bnj1000  32217  bnj1446  32321  bnj1447  32322  bnj1448  32323  bnj1466  32329  bnj1467  32330  bnj1519  32341  bnj1520  32342  bnj1529  32346  nosupbnd2  33220  poimirlem26  34922  nfopdALT  36111  nfaov  43385
  Copyright terms: Public domain W3C validator