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Theorem opeq2 3858
Description: Equality theorem for ordered pairs. (Contributed by NM, 25-Jun-1998.) (Revised by Mario Carneiro, 26-Apr-2015.)
Assertion
Ref Expression
opeq2 (𝐴 = 𝐵 → ⟨𝐶, 𝐴⟩ = ⟨𝐶, 𝐵⟩)

Proof of Theorem opeq2
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 eleq1 2292 . . . . . 6 (𝐴 = 𝐵 → (𝐴 ∈ V ↔ 𝐵 ∈ V))
21anbi2d 464 . . . . 5 (𝐴 = 𝐵 → ((𝐶 ∈ V ∧ 𝐴 ∈ V) ↔ (𝐶 ∈ V ∧ 𝐵 ∈ V)))
3 eqidd 2230 . . . . . . 7 (𝐴 = 𝐵 → {𝐶} = {𝐶})
4 preq2 3744 . . . . . . 7 (𝐴 = 𝐵 → {𝐶, 𝐴} = {𝐶, 𝐵})
53, 4preq12d 3751 . . . . . 6 (𝐴 = 𝐵 → {{𝐶}, {𝐶, 𝐴}} = {{𝐶}, {𝐶, 𝐵}})
65eleq2d 2299 . . . . 5 (𝐴 = 𝐵 → (𝑥 ∈ {{𝐶}, {𝐶, 𝐴}} ↔ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}}))
72, 6anbi12d 473 . . . 4 (𝐴 = 𝐵 → (((𝐶 ∈ V ∧ 𝐴 ∈ V) ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}}) ↔ ((𝐶 ∈ V ∧ 𝐵 ∈ V) ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}})))
8 df-3an 1004 . . . 4 ((𝐶 ∈ V ∧ 𝐴 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}}) ↔ ((𝐶 ∈ V ∧ 𝐴 ∈ V) ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}}))
9 df-3an 1004 . . . 4 ((𝐶 ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}}) ↔ ((𝐶 ∈ V ∧ 𝐵 ∈ V) ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}}))
107, 8, 93bitr4g 223 . . 3 (𝐴 = 𝐵 → ((𝐶 ∈ V ∧ 𝐴 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}}) ↔ (𝐶 ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}})))
1110abbidv 2347 . 2 (𝐴 = 𝐵 → {𝑥 ∣ (𝐶 ∈ V ∧ 𝐴 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}})} = {𝑥 ∣ (𝐶 ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}})})
12 df-op 3675 . 2 𝐶, 𝐴⟩ = {𝑥 ∣ (𝐶 ∈ V ∧ 𝐴 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐴}})}
13 df-op 3675 . 2 𝐶, 𝐵⟩ = {𝑥 ∣ (𝐶 ∈ V ∧ 𝐵 ∈ V ∧ 𝑥 ∈ {{𝐶}, {𝐶, 𝐵}})}
1411, 12, 133eqtr4g 2287 1 (𝐴 = 𝐵 → ⟨𝐶, 𝐴⟩ = ⟨𝐶, 𝐵⟩)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  w3a 1002   = wceq 1395  wcel 2200  {cab 2215  Vcvv 2799  {csn 3666  {cpr 3667  cop 3669
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-ext 2211
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-v 2801  df-un 3201  df-sn 3672  df-pr 3673  df-op 3675
This theorem is referenced by:  opeq12  3859  opeq2i  3861  opeq2d  3864  oteq2  3867  oteq3  3868  breq2  4087  cbvopab2  4158  cbvopab2v  4161  opthg  4324  eqvinop  4329  opelopabsb  4348  opelxp  4749  opabid2  4853  elrn2g  4912  opeldm  4926  opeldmg  4928  elrn2  4966  opelresg  5012  iss  5051  elimasng  5096  issref  5111  dmsnopg  5200  cnvsng  5214  elxp4  5216  elxp5  5217  dffun5r  5330  funopg  5352  f1osng  5616  tz6.12f  5658  fsn  5809  fsng  5810  fvsng  5839  oveq2  6015  cbvoprab2  6083  ovg  6150  opabex3d  6272  opabex3  6273  op1stg  6302  op2ndg  6303  oprssdmm  6323  op1steq  6331  dfoprab4f  6345  tfrlemibxssdm  6479  tfr1onlembxssdm  6495  tfrcllembxssdm  6508  elixpsn  6890  ixpsnf1o  6891  mapsnen  6972  xpsnen  6988  xpassen  6997  xpf1o  7013  djulclr  7227  djurclr  7228  djulcl  7229  djurcl  7230  djulclb  7233  inl11  7243  djuss  7248  1stinl  7252  2ndinl  7253  1stinr  7254  2ndinr  7255  elreal  8026  ax1rid  8075  fseq1p1m1  10302  pfxval  11221  swrdccatin1  11272  swrdccat3blem  11286  imasaddfnlemg  13362  cnmpt21  14980  djucllem  16219
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