Theorem cbvmpo2davw2 36521

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

Hypotheses

Ref	Expression
cbvmpo2davw2.1	⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝐸 = 𝐹)
cbvmpo2davw2.2	⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝐶 = 𝐷)
cbvmpo2davw2.3	⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝐴 = 𝐵)

Assertion

Ref	Expression
cbvmpo2davw2	⊢ (𝜑 → (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐶 ↦ 𝐸) = (𝑥 ∈ 𝐵, 𝑧 ∈ 𝐷 ↦ 𝐹))

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

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

Proof of Theorem cbvmpo2davw2

Dummy variable 𝑡 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		cbvmpo2davw2.3	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝐴 = 𝐵)
2	1	eleq2d 2825	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵))
3		simpr 485	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝑦 = 𝑧)
4		cbvmpo2davw2.2	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝐶 = 𝐷)
5	3, 4	eleq12d 2833	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → (𝑦 ∈ 𝐶 ↔ 𝑧 ∈ 𝐷))
6	2, 5	anbi12d 638	. . . 4 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ↔ (𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐷)))
7		cbvmpo2davw2.1	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝐸 = 𝐹)
8	7	eqeq2d 2750	. . . 4 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → (𝑡 = 𝐸 ↔ 𝑡 = 𝐹))
9	6, 8	anbi12d 638	. . 3 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → (((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸) ↔ ((𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐷) ∧ 𝑡 = 𝐹)))
10	9	cbvoprab2davw 36500	. 2 ⊢ (𝜑 → {⟨⟨𝑥, 𝑦⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸)} = {⟨⟨𝑥, 𝑧⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐷) ∧ 𝑡 = 𝐹)})
11		df-mpo 7361	. 2 ⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐶 ↦ 𝐸) = {⟨⟨𝑥, 𝑦⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸)}
12		df-mpo 7361	. 2 ⊢ (𝑥 ∈ 𝐵, 𝑧 ∈ 𝐷 ↦ 𝐹) = {⟨⟨𝑥, 𝑧⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐷) ∧ 𝑡 = 𝐹)}
13	10, 11, 12	3eqtr4g 2799	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐶 ↦ 𝐸) = (𝑥 ∈ 𝐵, 𝑧 ∈ 𝐷 ↦ 𝐹))

Syntax hints:   → wi 4   ∧ wa 396   = wceq 1547   ∈ wcel 2119  {coprab 7357   ∈ cmpo 7358

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2711

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-clab 2718  df-cleq 2731  df-clel 2814  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-oprab 7360  df-mpo 7361

This theorem is referenced by: (None)