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Theorem dfcoels 38412
Description: Alternate definition of the class of coelements on the class 𝐴. (Contributed by Peter Mazsa, 20-Apr-2019.)
Assertion
Ref Expression
dfcoels 𝐴 = {⟨𝑥, 𝑦⟩ ∣ ∃𝑢𝐴 (𝑥𝑢𝑦𝑢)}
Distinct variable group:   𝑢,𝐴,𝑥,𝑦

Proof of Theorem dfcoels
StepHypRef Expression
1 df-coels 38394 . 2 𝐴 = ≀ ( E ↾ 𝐴)
2 1cossres 38411 . 2 ≀ ( E ↾ 𝐴) = {⟨𝑥, 𝑦⟩ ∣ ∃𝑢𝐴 (𝑢 E 𝑥𝑢 E 𝑦)}
3 brcnvep 38247 . . . . . 6 (𝑢 ∈ V → (𝑢 E 𝑥𝑥𝑢))
43elv 3483 . . . . 5 (𝑢 E 𝑥𝑥𝑢)
5 brcnvep 38247 . . . . . 6 (𝑢 ∈ V → (𝑢 E 𝑦𝑦𝑢))
65elv 3483 . . . . 5 (𝑢 E 𝑦𝑦𝑢)
74, 6anbi12i 628 . . . 4 ((𝑢 E 𝑥𝑢 E 𝑦) ↔ (𝑥𝑢𝑦𝑢))
87rexbii 3092 . . 3 (∃𝑢𝐴 (𝑢 E 𝑥𝑢 E 𝑦) ↔ ∃𝑢𝐴 (𝑥𝑢𝑦𝑢))
98opabbii 5215 . 2 {⟨𝑥, 𝑦⟩ ∣ ∃𝑢𝐴 (𝑢 E 𝑥𝑢 E 𝑦)} = {⟨𝑥, 𝑦⟩ ∣ ∃𝑢𝐴 (𝑥𝑢𝑦𝑢)}
101, 2, 93eqtri 2767 1 𝐴 = {⟨𝑥, 𝑦⟩ ∣ ∃𝑢𝐴 (𝑥𝑢𝑦𝑢)}
Colors of variables: wff setvar class
Syntax hints:  wb 206  wa 395   = wceq 1537  wrex 3068  Vcvv 3478   class class class wbr 5148  {copab 5210   E cep 5588  ccnv 5688  cres 5691  ccoss 38162  ccoels 38163
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pr 5438
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-sb 2063  df-clab 2713  df-cleq 2727  df-clel 2814  df-ne 2939  df-ral 3060  df-rex 3069  df-rab 3434  df-v 3480  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4532  df-sn 4632  df-pr 4634  df-op 4638  df-br 5149  df-opab 5211  df-eprel 5589  df-xp 5695  df-rel 5696  df-cnv 5697  df-res 5701  df-coss 38393  df-coels 38394
This theorem is referenced by:  brcoels  38417
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