Theorem cnviun 43612

Description: Converse of indexed union. (Contributed by RP, 20-Jun-2020.)

Assertion

Ref	Expression
cnviun	⊢ ◡∪ 𝑥 ∈ 𝐴 𝐵 = ∪ 𝑥 ∈ 𝐴 ◡𝐵

Distinct variable group:   𝑥,𝐴

Allowed substitution hint:   𝐵(𝑥)

Proof of Theorem cnviun

Dummy variables 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		relcnv 6134	. 2 ⊢ Rel ◡∪ 𝑥 ∈ 𝐴 𝐵
2		reliun 5840	. . 3 ⊢ (Rel ∪ 𝑥 ∈ 𝐴 ◡𝐵 ↔ ∀𝑥 ∈ 𝐴 Rel ◡𝐵)
3		relcnv 6134	. . . 4 ⊢ Rel ◡𝐵
4	3	a1i 11	. . 3 ⊢ (𝑥 ∈ 𝐴 → Rel ◡𝐵)
5	2, 4	mprgbir 3074	. 2 ⊢ Rel ∪ 𝑥 ∈ 𝐴 ◡𝐵
6		vex 3492	. . . . . 6 ⊢ 𝑦 ∈ V
7		vex 3492	. . . . . 6 ⊢ 𝑧 ∈ V
8	6, 7	opelcnv 5906	. . . . 5 ⊢ (⟨𝑦, 𝑧⟩ ∈ ◡𝐵 ↔ ⟨𝑧, 𝑦⟩ ∈ 𝐵)
9	8	bicomi 224	. . . 4 ⊢ (⟨𝑧, 𝑦⟩ ∈ 𝐵 ↔ ⟨𝑦, 𝑧⟩ ∈ ◡𝐵)
10	9	rexbii 3100	. . 3 ⊢ (∃𝑥 ∈ 𝐴 ⟨𝑧, 𝑦⟩ ∈ 𝐵 ↔ ∃𝑥 ∈ 𝐴 ⟨𝑦, 𝑧⟩ ∈ ◡𝐵)
11	6, 7	opelcnv 5906	. . . 4 ⊢ (⟨𝑦, 𝑧⟩ ∈ ◡∪ 𝑥 ∈ 𝐴 𝐵 ↔ ⟨𝑧, 𝑦⟩ ∈ ∪ 𝑥 ∈ 𝐴 𝐵)
12		eliun 5019	. . . 4 ⊢ (⟨𝑧, 𝑦⟩ ∈ ∪ 𝑥 ∈ 𝐴 𝐵 ↔ ∃𝑥 ∈ 𝐴 ⟨𝑧, 𝑦⟩ ∈ 𝐵)
13	11, 12	bitri 275	. . 3 ⊢ (⟨𝑦, 𝑧⟩ ∈ ◡∪ 𝑥 ∈ 𝐴 𝐵 ↔ ∃𝑥 ∈ 𝐴 ⟨𝑧, 𝑦⟩ ∈ 𝐵)
14		eliun 5019	. . 3 ⊢ (⟨𝑦, 𝑧⟩ ∈ ∪ 𝑥 ∈ 𝐴 ◡𝐵 ↔ ∃𝑥 ∈ 𝐴 ⟨𝑦, 𝑧⟩ ∈ ◡𝐵)
15	10, 13, 14	3bitr4i 303	. 2 ⊢ (⟨𝑦, 𝑧⟩ ∈ ◡∪ 𝑥 ∈ 𝐴 𝐵 ↔ ⟨𝑦, 𝑧⟩ ∈ ∪ 𝑥 ∈ 𝐴 ◡𝐵)
16	1, 5, 15	eqrelriiv 5814	1 ⊢ ◡∪ 𝑥 ∈ 𝐴 𝐵 = ∪ 𝑥 ∈ 𝐴 ◡𝐵

Syntax hints:   = wceq 1537   ∈ wcel 2108  ∃wrex 3076  ⟨cop 4654  ∪ ciun 5015  ^◡ccnv 5699  Rel wrel 5705

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pr 5447

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-ss 3993  df-nul 4353  df-if 4549  df-sn 4649  df-pr 4651  df-op 4655  df-iun 5017  df-br 5167  df-opab 5229  df-xp 5706  df-rel 5707  df-cnv 5708

This theorem is referenced by:  cnvtrclfv  43686