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Theorem dmopab3 4968
Description: The domain of a restricted class of ordered pairs. (Contributed by NM, 31-Jan-2004.)
Assertion
Ref Expression
dmopab3 (∀𝑥𝐴𝑦𝜑 ↔ dom {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝜑)} = 𝐴)
Distinct variable group:   𝑥,𝑦,𝐴
Allowed substitution hints:   𝜑(𝑥,𝑦)

Proof of Theorem dmopab3
StepHypRef Expression
1 df-ral 2525 . 2 (∀𝑥𝐴𝑦𝜑 ↔ ∀𝑥(𝑥𝐴 → ∃𝑦𝜑))
2 pm4.71 389 . . 3 ((𝑥𝐴 → ∃𝑦𝜑) ↔ (𝑥𝐴 ↔ (𝑥𝐴 ∧ ∃𝑦𝜑)))
32albii 1519 . 2 (∀𝑥(𝑥𝐴 → ∃𝑦𝜑) ↔ ∀𝑥(𝑥𝐴 ↔ (𝑥𝐴 ∧ ∃𝑦𝜑)))
4 dmopab 4966 . . . . 5 dom {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝜑)} = {𝑥 ∣ ∃𝑦(𝑥𝐴𝜑)}
5 19.42v 1956 . . . . . 6 (∃𝑦(𝑥𝐴𝜑) ↔ (𝑥𝐴 ∧ ∃𝑦𝜑))
65abbii 2348 . . . . 5 {𝑥 ∣ ∃𝑦(𝑥𝐴𝜑)} = {𝑥 ∣ (𝑥𝐴 ∧ ∃𝑦𝜑)}
74, 6eqtri 2253 . . . 4 dom {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝜑)} = {𝑥 ∣ (𝑥𝐴 ∧ ∃𝑦𝜑)}
87eqeq1i 2240 . . 3 (dom {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝜑)} = 𝐴 ↔ {𝑥 ∣ (𝑥𝐴 ∧ ∃𝑦𝜑)} = 𝐴)
9 eqcom 2234 . . 3 (𝐴 = {𝑥 ∣ (𝑥𝐴 ∧ ∃𝑦𝜑)} ↔ {𝑥 ∣ (𝑥𝐴 ∧ ∃𝑦𝜑)} = 𝐴)
10 abeq2 2341 . . 3 (𝐴 = {𝑥 ∣ (𝑥𝐴 ∧ ∃𝑦𝜑)} ↔ ∀𝑥(𝑥𝐴 ↔ (𝑥𝐴 ∧ ∃𝑦𝜑)))
118, 9, 103bitr2ri 209 . 2 (∀𝑥(𝑥𝐴 ↔ (𝑥𝐴 ∧ ∃𝑦𝜑)) ↔ dom {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝜑)} = 𝐴)
121, 3, 113bitri 206 1 (∀𝑥𝐴𝑦𝜑 ↔ dom {⟨𝑥, 𝑦⟩ ∣ (𝑥𝐴𝜑)} = 𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  wb 105  wal 1396   = wceq 1398  wex 1541  wcel 2203  {cab 2218  wral 2520  {copab 4169  dom cdm 4748
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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4227  ax-pow 4286  ax-pr 4321
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-v 2814  df-un 3214  df-in 3216  df-ss 3223  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-br 4109  df-opab 4171  df-dm 4758
This theorem is referenced by:  dmxpm  4976  dmxpid  4977  fnopabg  5481  opabn1stprc  6388  acfun  7513  ccfunen  7577
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