Theorem cbvoprab3davw 36785

Description: Change the third bound variable in an operation abstraction. Deduction form. (Contributed by GG, 14-Aug-2025.)

Hypothesis

Ref	Expression
cbvoprab3davw.1	⊢ ((𝜑 ∧ 𝑧 = 𝑤) → (𝜓 ↔ 𝜒))

Assertion

Ref	Expression
cbvoprab3davw	⊢ (𝜑 → {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} = {⟨⟨𝑥, 𝑦⟩, 𝑤⟩ ∣ 𝜒})

Distinct variable groups:   𝜑,𝑥,𝑧,𝑤   𝜑,𝑦,𝑧,𝑤   𝜓,𝑤   𝜒,𝑧

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

Proof of Theorem cbvoprab3davw

Dummy variable 𝑡 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpr 489	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑧 = 𝑤) → 𝑧 = 𝑤)
2	1	opeq2d 4845	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑧 = 𝑤) → ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ = ⟨⟨𝑥, 𝑦⟩, 𝑤⟩)
3	2	eqeq2d 2774	. . . . . 6 ⊢ ((𝜑 ∧ 𝑧 = 𝑤) → (𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ↔ 𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑤⟩))
4		cbvoprab3davw.1	. . . . . 6 ⊢ ((𝜑 ∧ 𝑧 = 𝑤) → (𝜓 ↔ 𝜒))
5	3, 4	anbi12d 643	. . . . 5 ⊢ ((𝜑 ∧ 𝑧 = 𝑤) → ((𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓) ↔ (𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑤⟩ ∧ 𝜒)))
6	5	cbvexdvaw 2069	. . . 4 ⊢ (𝜑 → (∃𝑧(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓) ↔ ∃𝑤(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑤⟩ ∧ 𝜒)))
7	6	2exbidv 1954	. . 3 ⊢ (𝜑 → (∃𝑥∃𝑦∃𝑧(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓) ↔ ∃𝑥∃𝑦∃𝑤(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑤⟩ ∧ 𝜒)))
8	7	abbidv 2829	. 2 ⊢ (𝜑 → {𝑡 ∣ ∃𝑥∃𝑦∃𝑧(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓)} = {𝑡 ∣ ∃𝑥∃𝑦∃𝑤(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑤⟩ ∧ 𝜒)})
9		df-oprab 7414	. 2 ⊢ {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} = {𝑡 ∣ ∃𝑥∃𝑦∃𝑧(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∧ 𝜓)}
10		df-oprab 7414	. 2 ⊢ {⟨⟨𝑥, 𝑦⟩, 𝑤⟩ ∣ 𝜒} = {𝑡 ∣ ∃𝑥∃𝑦∃𝑤(𝑡 = ⟨⟨𝑥, 𝑦⟩, 𝑤⟩ ∧ 𝜒)}
11	8, 9, 10	3eqtr4g 2823	1 ⊢ (𝜑 → {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ 𝜓} = {⟨⟨𝑥, 𝑦⟩, 𝑤⟩ ∣ 𝜒})

Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 400   = wceq 1570  ∃wex 1809  {cab 2741  ⟨cop 4595  {coprab 7411

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-rab 3417  df-v 3457  df-dif 3908  df-un 3910  df-ss 3922  df-nul 4287  df-if 4488  df-sn 4590  df-pr 4592  df-op 4596  df-oprab 7414

This theorem is referenced by: (None)