ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  elab2g GIF version

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 → (𝜑𝜓))
elab2g.2 𝐵 = {𝑥𝜑}
Assertion
Ref Expression
elab2g (𝐴𝑉 → (𝐴𝐵𝜓))
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 = {𝑥𝜑}
21eleq2i 2305 . 2 (𝐴𝐵𝐴 ∈ {𝑥𝜑})
3 elab2g.1 . . 3 (𝑥 = 𝐴 → (𝜑𝜓))
43elabg 2972 . 2 (𝐴𝑉 → (𝐴 ∈ {𝑥𝜑} ↔ 𝜓))
52, 4bitrid 192 1 (𝐴𝑉 → (𝐴𝐵𝜓))
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  4400  elong  4518  opeliunxp  4830  elrn2g  4970  eldmg  4976  elrnmpt  5031  elrnmpt1  5033  elimag  5130  elrnmpog  6201  eloprabi  6432  tfrlem3ag  6580  tfr1onlem3ag  6608  tfrcllemsucaccv  6625  elqsg  6859  elixp2  6984  isomni  7476  ismkv  7493  iswomni  7505  isacnm  7559  1idprl  7957  1idpru  7958  recexprlemell  7989  recexprlemelu  7990  mertenslemub  12303  mertenslemi1  12304  mertenslem2  12305  4sqexercise1  13179  4sqexercise2  13180  4sqlemsdc  13181  ballotfilemfmpn  13236  ismgm  13679  istopg  15102  isbasisg  15147  2sqlem8  16254  2sqlem9  16255  isuhgrm  16324  isushgrm  16325  isupgren  16348  isumgren  16358  isuspgren  16410  isusgren  16411
  Copyright terms: Public domain W3C validator