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Theorem elab 2970
Description: Membership in a class abstraction, using implicit substitution. Compare Theorem 6.13 of [Quine] p. 44. (Contributed by NM, 1-Aug-1994.)
Hypotheses
Ref Expression
elab.1 𝐴 ∈ V
elab.2 (𝑥 = 𝐴 → (𝜑 ↔ 𝜓))
Assertion
Ref Expression
elab (𝐴 ∈ {𝑥 ∣ 𝜑} ↔ 𝜓)
Distinct variable groups:   𝜓,𝑥   𝑥,𝐴
Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem elab
StepHypRef Expression
1 nfv 1581 . 2 Ⅎ𝑥𝜓
2 elab.1 . 2 𝐴 ∈ V
3 elab.2 . 2 (𝑥 = 𝐴 → (𝜑 ↔ 𝜓))
41, 2, 3elabf 2969 1 (𝐴 ∈ {𝑥 ∣ 𝜑} ↔ 𝜓)
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ↔ wb 105   = wceq 1402   ∈ wcel 2209  {cab 2224  Vcvv 2821
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-v 2823
This theorem is used by:  ralab  2986  rexab  2988  intab  3999  dfiin2g  4045  dfiunv2  4048  uniuni  4599  dcextest  4730  peano5  4747  finds  4749  finds2  4750  funcnvuni  5453  fun11iun  5663  elabrex  5966  abrexco  5968  mapfset  6950  mapfoss  6952  fsetsspwxp  6953  mapval2  6964  ssenen  7158  snexxph  7274  sbthlem2  7282  f1setfi  7322  indpi  7715  nqprm  7915  nqprrnd  7916  nqprdisj  7917  nqprloc  7918  nqprl  7924  nqpru  7925  cauappcvgprlem2  8033  caucvgprlem2  8053  peano1nnnn  8225  peano2nnnn  8226  1nn  9324  peano2nn  9325  dfuzi  9766  hashfacen  11305  hashf1lem1  11306  hashf1lem2  11307  shftfvalg  11604  ovshftex  11605  shftfval  11607  4sqlemafi  13202  lss1d  14828  txdis1cn  15521  ushgredgedg  16689  ushgredgedgloop  16691  bj-ssom  17184
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