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Theorem elrabi 2832
Description: Implication for the membership in a restricted class abstraction. (Contributed by Alexander van der Vekens, 31-Dec-2017.)
Assertion
Ref Expression
elrabi (𝐴 ∈ {𝑥𝑉𝜑} → 𝐴𝑉)
Distinct variable groups:   𝑥,𝐴   𝑥,𝑉
Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem elrabi
StepHypRef Expression
1 clelab 2263 . . 3 (𝐴 ∈ {𝑥 ∣ (𝑥𝑉𝜑)} ↔ ∃𝑥(𝑥 = 𝐴 ∧ (𝑥𝑉𝜑)))
2 eleq1 2200 . . . . . 6 (𝑥 = 𝐴 → (𝑥𝑉𝐴𝑉))
32anbi1d 460 . . . . 5 (𝑥 = 𝐴 → ((𝑥𝑉𝜑) ↔ (𝐴𝑉𝜑)))
43simprbda 380 . . . 4 ((𝑥 = 𝐴 ∧ (𝑥𝑉𝜑)) → 𝐴𝑉)
54exlimiv 1577 . . 3 (∃𝑥(𝑥 = 𝐴 ∧ (𝑥𝑉𝜑)) → 𝐴𝑉)
61, 5sylbi 120 . 2 (𝐴 ∈ {𝑥 ∣ (𝑥𝑉𝜑)} → 𝐴𝑉)
7 df-rab 2423 . 2 {𝑥𝑉𝜑} = {𝑥 ∣ (𝑥𝑉𝜑)}
86, 7eleq2s 2232 1 (𝐴 ∈ {𝑥𝑉𝜑} → 𝐴𝑉)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103   = wceq 1331  wex 1468  wcel 1480  {cab 2123  {crab 2418
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-11 1484  ax-4 1487  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-ext 2119
This theorem depends on definitions:  df-bi 116  df-nf 1437  df-sb 1736  df-clab 2124  df-cleq 2130  df-clel 2133  df-rab 2423
This theorem is referenced by:  ordtriexmidlem  4430  ordtri2or2exmidlem  4436  onsucelsucexmidlem  4439  ordsoexmid  4472  reg3exmidlemwe  4488  elfvmptrab1  5508  acexmidlemcase  5762  ssfirab  6815  exmidonfinlem  7042  genpelvl  7313  genpelvu  7314  suplocsrlempr  7608  nnindnn  7694  sup3exmid  8708  nnind  8729  supinfneg  9383  infsupneg  9384  supminfex  9385  ublbneg  9398  hashinfuni  10516  zsupcllemstep  11627  infssuzex  11631  infssuzledc  11632  bezoutlemsup  11686  lcmgcdlem  11747  oddennn  11894  evenennn  11895  znnen  11900  ennnfonelemg  11905  txdis1cn  12436  reopnap  12696  divcnap  12713  limccl  12786  dvlemap  12807  dvaddxxbr  12823  dvmulxxbr  12824  dvcoapbr  12829  dvcjbr  12830  dvrecap  12835  dveflem  12844
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