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Theorem ecopqsi 6735
Description: "Closure" law for equivalence class of ordered pairs. (Contributed by NM, 25-Mar-1996.)
Hypotheses
Ref Expression
ecopqsi.1 𝑅 ∈ V
ecopqsi.2 𝑆 = ((𝐴 × 𝐴) / 𝑅)
Assertion
Ref Expression
ecopqsi ((𝐵𝐴𝐶𝐴) → [⟨𝐵, 𝐶⟩]𝑅𝑆)

Proof of Theorem ecopqsi
StepHypRef Expression
1 opelxpi 4750 . 2 ((𝐵𝐴𝐶𝐴) → ⟨𝐵, 𝐶⟩ ∈ (𝐴 × 𝐴))
2 ecopqsi.1 . . . 4 𝑅 ∈ V
32ecelqsi 6734 . . 3 (⟨𝐵, 𝐶⟩ ∈ (𝐴 × 𝐴) → [⟨𝐵, 𝐶⟩]𝑅 ∈ ((𝐴 × 𝐴) / 𝑅))
4 ecopqsi.2 . . 3 𝑆 = ((𝐴 × 𝐴) / 𝑅)
53, 4eleqtrrdi 2323 . 2 (⟨𝐵, 𝐶⟩ ∈ (𝐴 × 𝐴) → [⟨𝐵, 𝐶⟩]𝑅𝑆)
61, 5syl 14 1 ((𝐵𝐴𝐶𝐴) → [⟨𝐵, 𝐶⟩]𝑅𝑆)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1395  wcel 2200  Vcvv 2799  cop 3669   × cxp 4716  [cec 6676   / cqs 6677
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4201  ax-pow 4257  ax-pr 4292  ax-un 4523
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2801  df-un 3201  df-in 3203  df-ss 3210  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-uni 3888  df-br 4083  df-opab 4145  df-xp 4724  df-cnv 4726  df-dm 4728  df-rn 4729  df-res 4730  df-ima 4731  df-ec 6680  df-qs 6684
This theorem is referenced by:  brecop  6770  recexgt0sr  7956  ltpsrprg  7986
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