Theorem elab2g 2911

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

Step	Hyp	Ref	Expression
1		elab2g.2	. . 3 ⊢ 𝐵 = {𝑥 ∣ 𝜑}
2	1	eleq2i 2263	. 2 ⊢ (𝐴 ∈ 𝐵 ↔ 𝐴 ∈ {𝑥 ∣ 𝜑})
3		elab2g.1	. . 3 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓))
4	3	elabg 2910	. 2 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ {𝑥 ∣ 𝜑} ↔ 𝜓))
5	2, 4	bitrid 192	1 ⊢ (𝐴 ∈ 𝑉 → (𝐴 ∈ 𝐵 ↔ 𝜓))

Syntax hints:   → wi 4   ↔ wb 105   = wceq 1364   ∈ wcel 2167  {cab 2182

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 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178

This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-v 2765

This theorem is referenced by:  elab2  2912  elab4g  2913  eldif  3166  elun  3305  elin  3347  elsng  3638  elprg  3643  eluni  3843  eliun  3921  eliin  3922  elopab  4293  elong  4409  opeliunxp  4719  elrn2g  4857  eldmg  4862  elrnmpt  4916  elrnmpt1  4918  elimag  5014  elrnmpog  6039  eloprabi  6263  tfrlem3ag  6376  tfr1onlem3ag  6404  tfrcllemsucaccv  6421  elqsg  6653  elixp2  6770  isomni  7211  ismkv  7228  iswomni  7240  isacnm  7286  1idprl  7674  1idpru  7675  recexprlemell  7706  recexprlemelu  7707  mertenslemub  11716  mertenslemi1  11717  mertenslem2  11718  4sqexercise1  12592  4sqexercise2  12593  4sqlemsdc  12594  ismgm  13059  istopg  14319  isbasisg  14364  2sqlem8  15448  2sqlem9  15449