Theorem cbviuneq12dv 44408

Description: Rule used to change the bound variables and classes in an indexed union, with the substitution specified implicitly by the hypothesis. (Contributed by RP, 17-Jul-2020.)

Hypotheses

Ref	Expression
cbviuneq12dv.xel	⊢ ((𝜑 ∧ 𝑦 ∈ 𝐶) → 𝑋 ∈ 𝐴)
cbviuneq12dv.yel	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑌 ∈ 𝐶)
cbviuneq12dv.xsub	⊢ ((𝜑 ∧ 𝑦 ∈ 𝐶 ∧ 𝑥 = 𝑋) → 𝐵 = 𝐹)
cbviuneq12dv.ysub	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴 ∧ 𝑦 = 𝑌) → 𝐷 = 𝐺)
cbviuneq12dv.eq1	⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 = 𝐺)
cbviuneq12dv.eq2	⊢ ((𝜑 ∧ 𝑦 ∈ 𝐶) → 𝐷 = 𝐹)

Assertion

Ref	Expression
cbviuneq12dv	⊢ (𝜑 → ∪ 𝑥 ∈ 𝐴 𝐵 = ∪ 𝑦 ∈ 𝐶 𝐷)

Distinct variable groups:   𝑥,𝑦,𝜑   𝑥,𝐴,𝑦   𝑦,𝐵   𝑥,𝐶,𝑦   𝑥,𝐷   𝑥,𝐹   𝑦,𝐺   𝑥,𝑋   𝑦,𝑌

Allowed substitution hints:   𝐵(𝑥)   𝐷(𝑦)   𝐹(𝑦)   𝐺(𝑥)   𝑋(𝑦)   𝑌(𝑥)

Proof of Theorem cbviuneq12dv

Step	Hyp	Ref	Expression
1		nfv 1944	. 2 ⊢ Ⅎ𝑥𝜑
2		nfv 1944	. 2 ⊢ Ⅎ𝑦𝜑
3		nfcv 2925	. 2 ⊢ Ⅎ𝑥𝑋
4		nfcv 2925	. 2 ⊢ Ⅎ𝑦𝑌
5		nfcv 2925	. 2 ⊢ Ⅎ𝑥𝐴
6		nfcv 2925	. 2 ⊢ Ⅎ𝑦𝐴
7		nfcv 2925	. 2 ⊢ Ⅎ𝑦𝐵
8		nfcv 2925	. 2 ⊢ Ⅎ𝑥𝐶
9		nfcv 2925	. 2 ⊢ Ⅎ𝑦𝐶
10		nfcv 2925	. 2 ⊢ Ⅎ𝑥𝐷
11		nfcv 2925	. 2 ⊢ Ⅎ𝑥𝐹
12		nfcv 2925	. 2 ⊢ Ⅎ𝑦𝐺
13		cbviuneq12dv.xel	. 2 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐶) → 𝑋 ∈ 𝐴)
14		cbviuneq12dv.yel	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝑌 ∈ 𝐶)
15		cbviuneq12dv.xsub	. 2 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐶 ∧ 𝑥 = 𝑋) → 𝐵 = 𝐹)
16		cbviuneq12dv.ysub	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴 ∧ 𝑦 = 𝑌) → 𝐷 = 𝐺)
17		cbviuneq12dv.eq1	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝐵 = 𝐺)
18		cbviuneq12dv.eq2	. 2 ⊢ ((𝜑 ∧ 𝑦 ∈ 𝐶) → 𝐷 = 𝐹)
19	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18	cbviuneq12df 44407	1 ⊢ (𝜑 → ∪ 𝑥 ∈ 𝐴 𝐵 = ∪ 𝑦 ∈ 𝐶 𝐷)

Syntax hints:   → wi 4   ∧ wa 400   ∧ w3a 1103   = wceq 1570   ∈ wcel 2143  ∪ ciun 4956

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-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-ex 1810  df-nf 1814  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ral 3080  df-rex 3090  df-v 3457  df-ss 3922  df-iun 4958

This theorem is referenced by:  trclfvdecomr  44474