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Theorem cbvopab 5221
Description: Rule used to change bound variables in an ordered-pair class abstraction, using implicit substitution. (Contributed by NM, 14-Sep-2003.)
Hypotheses
Ref Expression
cbvopab.1 𝑧𝜑
cbvopab.2 𝑤𝜑
cbvopab.3 𝑥𝜓
cbvopab.4 𝑦𝜓
cbvopab.5 ((𝑥 = 𝑧𝑦 = 𝑤) → (𝜑𝜓))
Assertion
Ref Expression
cbvopab {⟨𝑥, 𝑦⟩ ∣ 𝜑} = {⟨𝑧, 𝑤⟩ ∣ 𝜓}
Distinct variable group:   𝑥,𝑦,𝑧,𝑤
Allowed substitution hints:   𝜑(𝑥,𝑦,𝑧,𝑤)   𝜓(𝑥,𝑦,𝑧,𝑤)

Proof of Theorem cbvopab
Dummy variable 𝑣 is distinct from all other variables.
StepHypRef Expression
1 nfv 1918 . . . . 5 𝑧 𝑣 = ⟨𝑥, 𝑦
2 cbvopab.1 . . . . 5 𝑧𝜑
31, 2nfan 1903 . . . 4 𝑧(𝑣 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)
4 nfv 1918 . . . . 5 𝑤 𝑣 = ⟨𝑥, 𝑦
5 cbvopab.2 . . . . 5 𝑤𝜑
64, 5nfan 1903 . . . 4 𝑤(𝑣 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)
7 nfv 1918 . . . . 5 𝑥 𝑣 = ⟨𝑧, 𝑤
8 cbvopab.3 . . . . 5 𝑥𝜓
97, 8nfan 1903 . . . 4 𝑥(𝑣 = ⟨𝑧, 𝑤⟩ ∧ 𝜓)
10 nfv 1918 . . . . 5 𝑦 𝑣 = ⟨𝑧, 𝑤
11 cbvopab.4 . . . . 5 𝑦𝜓
1210, 11nfan 1903 . . . 4 𝑦(𝑣 = ⟨𝑧, 𝑤⟩ ∧ 𝜓)
13 opeq12 4876 . . . . . 6 ((𝑥 = 𝑧𝑦 = 𝑤) → ⟨𝑥, 𝑦⟩ = ⟨𝑧, 𝑤⟩)
1413eqeq2d 2744 . . . . 5 ((𝑥 = 𝑧𝑦 = 𝑤) → (𝑣 = ⟨𝑥, 𝑦⟩ ↔ 𝑣 = ⟨𝑧, 𝑤⟩))
15 cbvopab.5 . . . . 5 ((𝑥 = 𝑧𝑦 = 𝑤) → (𝜑𝜓))
1614, 15anbi12d 632 . . . 4 ((𝑥 = 𝑧𝑦 = 𝑤) → ((𝑣 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ (𝑣 = ⟨𝑧, 𝑤⟩ ∧ 𝜓)))
173, 6, 9, 12, 16cbvex2v 2341 . . 3 (∃𝑥𝑦(𝑣 = ⟨𝑥, 𝑦⟩ ∧ 𝜑) ↔ ∃𝑧𝑤(𝑣 = ⟨𝑧, 𝑤⟩ ∧ 𝜓))
1817abbii 2803 . 2 {𝑣 ∣ ∃𝑥𝑦(𝑣 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)} = {𝑣 ∣ ∃𝑧𝑤(𝑣 = ⟨𝑧, 𝑤⟩ ∧ 𝜓)}
19 df-opab 5212 . 2 {⟨𝑥, 𝑦⟩ ∣ 𝜑} = {𝑣 ∣ ∃𝑥𝑦(𝑣 = ⟨𝑥, 𝑦⟩ ∧ 𝜑)}
20 df-opab 5212 . 2 {⟨𝑧, 𝑤⟩ ∣ 𝜓} = {𝑣 ∣ ∃𝑧𝑤(𝑣 = ⟨𝑧, 𝑤⟩ ∧ 𝜓)}
2118, 19, 203eqtr4i 2771 1 {⟨𝑥, 𝑦⟩ ∣ 𝜑} = {⟨𝑧, 𝑤⟩ ∣ 𝜓}
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 397   = wceq 1542  wex 1782  wnf 1786  {cab 2710  cop 4635  {copab 5211
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2704
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-clab 2711  df-cleq 2725  df-clel 2811  df-rab 3434  df-v 3477  df-dif 3952  df-un 3954  df-in 3956  df-ss 3966  df-nul 4324  df-if 4530  df-sn 4630  df-pr 4632  df-op 4636  df-opab 5212
This theorem is referenced by:  cbvopabvOLD  5223  dfrel4  6191  bj-opabco  36069  aomclem8  41803
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