Theorem cbvmpo1davw2 36271

Description: Change first bound variable and domains in a maps-to function. Deduction form. (Contributed by GG, 14-Aug-2025.)

Hypotheses

Ref	Expression
cbvmpo1davw2.1	⊢ ((𝜑 ∧ 𝑥 = 𝑧) → 𝐸 = 𝐹)
cbvmpo1davw2.2	⊢ ((𝜑 ∧ 𝑥 = 𝑧) → 𝐶 = 𝐷)
cbvmpo1davw2.3	⊢ ((𝜑 ∧ 𝑥 = 𝑧) → 𝐴 = 𝐵)

Assertion

Ref	Expression
cbvmpo1davw2	⊢ (𝜑 → (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐶 ↦ 𝐸) = (𝑧 ∈ 𝐵, 𝑦 ∈ 𝐷 ↦ 𝐹))

Distinct variable groups:   𝜑,𝑥,𝑦,𝑧   𝑧,𝐴   𝑥,𝐵   𝑧,𝐶   𝑥,𝐷   𝑧,𝐸   𝑥,𝐹

Allowed substitution hints:   𝐴(𝑥,𝑦)   𝐵(𝑦,𝑧)   𝐶(𝑥,𝑦)   𝐷(𝑦,𝑧)   𝐸(𝑥,𝑦)   𝐹(𝑦,𝑧)

Proof of Theorem cbvmpo1davw2

Dummy variable 𝑡 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpr 484	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → 𝑥 = 𝑧)
2		cbvmpo1davw2.3	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → 𝐴 = 𝐵)
3	1, 2	eleq12d 2834	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → (𝑥 ∈ 𝐴 ↔ 𝑧 ∈ 𝐵))
4		cbvmpo1davw2.2	. . . . . 6 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → 𝐶 = 𝐷)
5	4	eleq2d 2826	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → (𝑦 ∈ 𝐶 ↔ 𝑦 ∈ 𝐷))
6	3, 5	anbi12d 632	. . . 4 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ↔ (𝑧 ∈ 𝐵 ∧ 𝑦 ∈ 𝐷)))
7		cbvmpo1davw2.1	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → 𝐸 = 𝐹)
8	7	eqeq2d 2747	. . . 4 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → (𝑡 = 𝐸 ↔ 𝑡 = 𝐹))
9	6, 8	anbi12d 632	. . 3 ⊢ ((𝜑 ∧ 𝑥 = 𝑧) → (((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸) ↔ ((𝑧 ∈ 𝐵 ∧ 𝑦 ∈ 𝐷) ∧ 𝑡 = 𝐹)))
10	9	cbvoprab1davw 36250	. 2 ⊢ (𝜑 → {⟨⟨𝑥, 𝑦⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸)} = {⟨⟨𝑧, 𝑦⟩, 𝑡⟩ ∣ ((𝑧 ∈ 𝐵 ∧ 𝑦 ∈ 𝐷) ∧ 𝑡 = 𝐹)})
11		df-mpo 7434	. 2 ⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐶 ↦ 𝐸) = {⟨⟨𝑥, 𝑦⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸)}
12		df-mpo 7434	. 2 ⊢ (𝑧 ∈ 𝐵, 𝑦 ∈ 𝐷 ↦ 𝐹) = {⟨⟨𝑧, 𝑦⟩, 𝑡⟩ ∣ ((𝑧 ∈ 𝐵 ∧ 𝑦 ∈ 𝐷) ∧ 𝑡 = 𝐹)}
13	10, 11, 12	3eqtr4g 2801	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐶 ↦ 𝐸) = (𝑧 ∈ 𝐵, 𝑦 ∈ 𝐷 ↦ 𝐹))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1540   ∈ wcel 2108  {coprab 7430   ∈ cmpo 7431

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2707

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2065  df-clab 2714  df-cleq 2728  df-clel 2815  df-rab 3436  df-v 3481  df-dif 3953  df-un 3955  df-ss 3967  df-nul 4333  df-if 4525  df-sn 4625  df-pr 4627  df-op 4631  df-oprab 7433  df-mpo 7434

This theorem is referenced by: (None)