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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  6949  mapfoss  6951  fsetsspwxp  6952  mapval2  6963  ssenen  7157  snexxph  7273  sbthlem2  7281  f1setfi  7323  indpi  7716  nqprm  7916  nqprrnd  7917  nqprdisj  7918  nqprloc  7919  nqprl  7925  nqpru  7926  cauappcvgprlem2  8034  caucvgprlem2  8054  peano1nnnn  8226  peano2nnnn  8227  1nn  9325  peano2nn  9326  dfuzi  9768  hashfacen  11307  hashf1lem1  11308  hashf1lem2  11309  shftfvalg  11606  ovshftex  11607  shftfval  11609  4sqlemafi  13204  lss1d  14830  txdis1cn  15516  ushgredgedg  16684  ushgredgedgloop  16686  bj-ssom  17179
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