Theorem cbvoprab123vw 36273

Description: Change all bound variables in an operation abstraction, using implicit substitution. (Contributed by GG, 14-Aug-2025.)

Hypothesis

Ref	Expression
cbvoprab123vw.1	⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → (𝜓 ↔ 𝜒))

Assertion

Ref	Expression
cbvoprab123vw	⊢ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} = {⟨⟨𝑤, 𝑢⟩, 𝑣⟩ ∣ 𝜒}

Distinct variable groups:   𝑥,𝑦,𝑧,𝑤,𝑢,𝑣   𝜓,𝑤,𝑢,𝑣   𝜒,𝑥,𝑦,𝑧

Allowed substitution hints:   𝜓(𝑥,𝑦,𝑧)   𝜒(𝑤,𝑣,𝑢)

Proof of Theorem cbvoprab123vw

Dummy variable 𝑡 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpll 766	. . . . . . . . 9 ⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → 𝑥 = 𝑤)
2		simplr 768	. . . . . . . . 9 ⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → 𝑦 = 𝑢)
3	1, 2	opeq12d 4828	. . . . . . . 8 ⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → ⟨𝑥, 𝑦⟩ = ⟨𝑤, 𝑢⟩)
4		simpr 484	. . . . . . . 8 ⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → 𝑧 = 𝑣)
5	3, 4	opeq12d 4828	. . . . . . 7 ⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ = ⟨⟨𝑤, 𝑢⟩, 𝑣⟩)
6	5	eqeq2d 2742	. . . . . 6 ⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → (𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ↔ 𝑡 = ⟨⟨𝑤, 𝑢⟩, 𝑣⟩))
7		cbvoprab123vw.1	. . . . . 6 ⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → (𝜓 ↔ 𝜒))
8	6, 7	anbi12d 632	. . . . 5 ⊢ (((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) ∧ 𝑧 = 𝑣) → ((𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓) ↔ (𝑡 = ⟨⟨𝑤, 𝑢⟩, 𝑣⟩ ∧ 𝜒)))
9	8	cbvexdvaw 2040	. . . 4 ⊢ ((𝑥 = 𝑤 ∧ 𝑦 = 𝑢) → (∃𝑧(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓) ↔ ∃𝑣(𝑡 = ⟨⟨𝑤, 𝑢⟩, 𝑣⟩ ∧ 𝜒)))
10	9	cbvex2vw 2042	. . 3 ⊢ (∃𝑥∃𝑦∃𝑧(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓) ↔ ∃𝑤∃𝑢∃𝑣(𝑡 = ⟨⟨𝑤, 𝑢⟩, 𝑣⟩ ∧ 𝜒))
11	10	abbii 2798	. 2 ⊢ {𝑡 ∣ ∃𝑥∃𝑦∃𝑧(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓)} = {𝑡 ∣ ∃𝑤∃𝑢∃𝑣(𝑡 = ⟨⟨𝑤, 𝑢⟩, 𝑣⟩ ∧ 𝜒)}
12		df-oprab 7345	. 2 ⊢ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} = {𝑡 ∣ ∃𝑥∃𝑦∃𝑧(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓)}
13		df-oprab 7345	. 2 ⊢ {⟨⟨𝑤, 𝑢⟩, 𝑣⟩ ∣ 𝜒} = {𝑡 ∣ ∃𝑤∃𝑢∃𝑣(𝑡 = ⟨⟨𝑤, 𝑢⟩, 𝑣⟩ ∧ 𝜒)}
14	11, 12, 13	3eqtr4i 2764	1 ⊢ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} = {⟨⟨𝑤, 𝑢⟩, 𝑣⟩ ∣ 𝜒}

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395   = wceq 1541  ∃wex 1780  {cab 2709  ⟨cop 4577  {coprab 7342

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-ext 2703

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2710  df-cleq 2723  df-clel 2806  df-rab 3396  df-v 3438  df-dif 3900  df-un 3902  df-ss 3914  df-nul 4279  df-if 4471  df-sn 4572  df-pr 4574  df-op 4578  df-oprab 7345

This theorem is referenced by: (None)