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Theorem elab2g 2973
Description: Membership in a class abstraction, using implicit substitution. (Contributed by NM, 13-Sep-1995.)
Hypotheses
Ref Expression
elab2g.1 (𝑥 = 𝐴 → (𝜑 ↔ 𝜓))
elab2g.2 𝐵 = {𝑥 ∣ 𝜑}
Assertion
Ref Expression
elab2g (𝐴 ∈ 𝑉 → (𝐴 ∈ 𝐵 ↔ 𝜓))
Distinct variable groups:   𝜓,𝑥   𝑥,𝐴
Allowed substitution hints:   𝜑(𝑥)   𝐵(𝑥)   𝑉(𝑥)

Proof of Theorem elab2g
StepHypRef Expression
1 elab2g.2 . . 3 𝐵 = {𝑥 ∣ 𝜑}
21eleq2i 2305 . 2 (𝐴 ∈ 𝐵 ↔ 𝐴 ∈ {𝑥 ∣ 𝜑})
3 elab2g.1 . . 3 (𝑥 = 𝐴 → (𝜑 ↔ 𝜓))
43elabg 2972 . 2 (𝐴 ∈ 𝑉 → (𝐴 ∈ {𝑥 ∣ 𝜑} ↔ 𝜓))
52, 4bitrid 192 1 (𝐴 ∈ 𝑉 → (𝐴 ∈ 𝐵 ↔ 𝜓))
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ↔ wb 105   = wceq 1402   ∈ wcel 2209  {cab 2224
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:  elab2  2974  elab4g  2975  eldif  3229  elun  3370  elin  3412  elif  3652  elsng  3724  elprg  3729  eluni  3938  eliun  4016  eliin  4017  elopab  4402  elong  4520  opeliunxp  4832  elrn2g  4972  eldmg  4978  elrnmpt  5033  elrnmpt1  5035  elimag  5133  elrnmpog  6204  eloprabi  6436  tfrlem3ag  6584  tfr1onlem3ag  6612  tfrcllemsucaccv  6629  elqsg  6863  elixp2  6989  isomni  7483  ismkv  7500  iswomni  7512  isacnm  7566  1idprl  7964  1idpru  7965  recexprlemell  7996  recexprlemelu  7997  mertenslemub  12327  mertenslemi1  12328  mertenslem2  12329  4sqexercise1  13207  4sqexercise2  13208  4sqlemsdc  13209  ballotfilemfmpn  13293  ismgm  13737  istopg  15237  isbasisg  15282  2sqlem8  16459  2sqlem9  16460  isuhgrm  16529  isushgrm  16530  isupgren  16553  isumgren  16563  isuspgren  16615  isusgren  16616
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