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Theorem dfoprab3s 7741
Description: A way to define an operation class abstraction without using existential quantifiers. (Contributed by NM, 18-Aug-2006.) (Revised by Mario Carneiro, 31-Aug-2015.)
Assertion
Ref Expression
dfoprab3s {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} = {⟨𝑤, 𝑧⟩ ∣ (𝑤 ∈ (V × V) ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑)}
Distinct variable groups:   𝜑,𝑤   𝑥,𝑦,𝑧,𝑤
Allowed substitution hints:   𝜑(𝑥,𝑦,𝑧)

Proof of Theorem dfoprab3s
StepHypRef Expression
1 dfoprab2 7201 . 2 {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} = {⟨𝑤, 𝑧⟩ ∣ ∃𝑥𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)}
2 nfsbc1v 3778 . . . . 5 𝑥[(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑
3219.41 2239 . . . 4 (∃𝑥(∃𝑦 𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑) ↔ (∃𝑥𝑦 𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑))
4 sbcopeq1a 7738 . . . . . . . 8 (𝑤 = ⟨𝑥, 𝑦⟩ → ([(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑𝜑))
54pm5.32i 578 . . . . . . 7 ((𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑) ↔ (𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑))
65exbii 1849 . . . . . 6 (∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑) ↔ ∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑))
7 nfcv 2982 . . . . . . . 8 𝑦(1st𝑤)
8 nfsbc1v 3778 . . . . . . . 8 𝑦[(2nd𝑤) / 𝑦]𝜑
97, 8nfsbcw 3780 . . . . . . 7 𝑦[(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑
10919.41 2239 . . . . . 6 (∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑) ↔ (∃𝑦 𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑))
116, 10bitr3i 280 . . . . 5 (∃𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ (∃𝑦 𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑))
1211exbii 1849 . . . 4 (∃𝑥𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ ∃𝑥(∃𝑦 𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑))
13 elvv 5613 . . . . 5 (𝑤 ∈ (V × V) ↔ ∃𝑥𝑦 𝑤 = ⟨𝑥, 𝑦⟩)
1413anbi1i 626 . . . 4 ((𝑤 ∈ (V × V) ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑) ↔ (∃𝑥𝑦 𝑤 = ⟨𝑥, 𝑦⟩ ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑))
153, 12, 143bitr4i 306 . . 3 (∃𝑥𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ (𝑤 ∈ (V × V) ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑))
1615opabbii 5119 . 2 {⟨𝑤, 𝑧⟩ ∣ ∃𝑥𝑦(𝑤 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)} = {⟨𝑤, 𝑧⟩ ∣ (𝑤 ∈ (V × V) ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑)}
171, 16eqtri 2847 1 {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜑} = {⟨𝑤, 𝑧⟩ ∣ (𝑤 ∈ (V × V) ∧ [(1st𝑤) / 𝑥][(2nd𝑤) / 𝑦]𝜑)}
Colors of variables: wff setvar class
Syntax hints:  wa 399   = wceq 1538  wex 1781  wcel 2115  Vcvv 3480  [wsbc 3758  cop 4555  {copab 5114   × cxp 5540  cfv 6343  {coprab 7146  1st c1st 7677  2nd c2nd 7678
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1971  ax-7 2016  ax-8 2117  ax-9 2125  ax-10 2146  ax-11 2162  ax-12 2179  ax-ext 2796  ax-sep 5189  ax-nul 5196  ax-pow 5253  ax-pr 5317  ax-un 7451
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2071  df-mo 2624  df-eu 2655  df-clab 2803  df-cleq 2817  df-clel 2896  df-nfc 2964  df-ral 3138  df-rex 3139  df-rab 3142  df-v 3482  df-sbc 3759  df-dif 3922  df-un 3924  df-in 3926  df-ss 3936  df-nul 4276  df-if 4450  df-sn 4550  df-pr 4552  df-op 4556  df-uni 4825  df-br 5053  df-opab 5115  df-mpt 5133  df-id 5447  df-xp 5548  df-rel 5549  df-cnv 5550  df-co 5551  df-dm 5552  df-rn 5553  df-iota 6302  df-fun 6345  df-fv 6351  df-oprab 7149  df-1st 7679  df-2nd 7680
This theorem is referenced by:  dfoprab3  7742
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