Theorem cbvmpo2davw2 37206

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 2846	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵))
3		simpr 490	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝑦 = 𝑧)
4		cbvmpo2davw2.2	. . . . . 6 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝐶 = 𝐷)
5	3, 4	eleq12d 2854	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → (𝑦 ∈ 𝐶 ↔ 𝑧 ∈ 𝐷))
6	2, 5	anbi12d 644	. . . 4 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ↔ (𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐷)))
7		cbvmpo2davw2.1	. . . . 5 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → 𝐸 = 𝐹)
8	7	eqeq2d 2771	. . . 4 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → (𝑡 = 𝐸 ↔ 𝑡 = 𝐹))
9	6, 8	anbi12d 644	. . 3 ⊢ ((𝜑 ∧ 𝑦 = 𝑧) → (((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸) ↔ ((𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐷) ∧ 𝑡 = 𝐹)))
10	9	cbvoprab2davw 37185	. 2 ⊢ (𝜑 → {⟨⟨𝑥, 𝑦⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸)} = {⟨⟨𝑥, 𝑧⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐷) ∧ 𝑡 = 𝐹)})
11		df-mpo 7429	. 2 ⊢ (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐶 ↦ 𝐸) = {⟨⟨𝑥, 𝑦⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐶) ∧ 𝑡 = 𝐸)}
12		df-mpo 7429	. 2 ⊢ (𝑥 ∈ 𝐵, 𝑧 ∈ 𝐷 ↦ 𝐹) = {⟨⟨𝑥, 𝑧⟩, 𝑡⟩ ∣ ((𝑥 ∈ 𝐵 ∧ 𝑧 ∈ 𝐷) ∧ 𝑡 = 𝐹)}
13	10, 11, 12	3eqtr4g 2820	1 ⊢ (𝜑 → (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐶 ↦ 𝐸) = (𝑥 ∈ 𝐵, 𝑧 ∈ 𝐷 ↦ 𝐹))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1569   ∈ wcel 2144  {coprab 7425   ∈ cmpo 7426

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-rab 3413  df-v 3452  df-ss 3897  df-dif 4046  df-un 4150  df-nul 4278  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-oprab 7428  df-mpo 7429

This theorem is used by: (None)