Theorem brbigcup 36287

Description: Binary relation over Bigcup . (Contributed by Scott Fenton, 11-Apr-2012.)

Hypothesis

Ref	Expression
brbigcup.1	⊢ 𝐵 ∈ V

Assertion

Ref	Expression
brbigcup	⊢ (𝐴 Bigcup 𝐵 ↔ ∪ 𝐴 = 𝐵)

Proof of Theorem brbigcup

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

Step	Hyp	Ref	Expression
1		relbigcup 36286	. . 3 ⊢ Rel Bigcup
2	1	brrelex1i 5718	. 2 ⊢ (𝐴 Bigcup 𝐵 → 𝐴 ∈ V)
3		brbigcup.1	. . . 4 ⊢ 𝐵 ∈ V
4		eleq1 2857	. . . 4 ⊢ (∪ 𝐴 = 𝐵 → (∪ 𝐴 ∈ V ↔ 𝐵 ∈ V))
5	3, 4	mpbiri 261	. . 3 ⊢ (∪ 𝐴 = 𝐵 → ∪ 𝐴 ∈ V)
6		uniexb 7763	. . 3 ⊢ (𝐴 ∈ V ↔ ∪ 𝐴 ∈ V)
7	5, 6	sylibr 237	. 2 ⊢ (∪ 𝐴 = 𝐵 → 𝐴 ∈ V)
8		breq1 5116	. . 3 ⊢ (𝑥 = 𝐴 → (𝑥 Bigcup 𝐵 ↔ 𝐴 Bigcup 𝐵))
9		unieq 4887	. . . 4 ⊢ (𝑥 = 𝐴 → ∪ 𝑥 = ∪ 𝐴)
10	9	eqeq1d 2771	. . 3 ⊢ (𝑥 = 𝐴 → (∪ 𝑥 = 𝐵 ↔ ∪ 𝐴 = 𝐵))
11		vex 3467	. . . . 5 ⊢ 𝑥 ∈ V
12		df-bigcup 36247	. . . . 5 ⊢ Bigcup = ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ E ) ⊗ V)))
13		brxp 5711	. . . . . 6 ⊢ (𝑥(V × V)𝐵 ↔ (𝑥 ∈ V ∧ 𝐵 ∈ V))
14	11, 3, 13	mpbir2an 723	. . . . 5 ⊢ 𝑥(V × V)𝐵
15		epel 5565	. . . . . . 7 ⊢ (𝑦 E 𝑧 ↔ 𝑦 ∈ 𝑧)
16	15	rexbii 3118	. . . . . 6 ⊢ (∃𝑧 ∈ 𝑥 𝑦 E 𝑧 ↔ ∃𝑧 ∈ 𝑥 𝑦 ∈ 𝑧)
17		vex 3467	. . . . . . 7 ⊢ 𝑦 ∈ V
18	17, 11	coep 36143	. . . . . 6 ⊢ (𝑦( E ∘ E )𝑥 ↔ ∃𝑧 ∈ 𝑥 𝑦 E 𝑧)
19		eluni2 4880	. . . . . 6 ⊢ (𝑦 ∈ ∪ 𝑥 ↔ ∃𝑧 ∈ 𝑥 𝑦 ∈ 𝑧)
20	16, 18, 19	3bitr4ri 307	. . . . 5 ⊢ (𝑦 ∈ ∪ 𝑥 ↔ 𝑦( E ∘ E )𝑥)
21	11, 3, 12, 14, 20	brtxpsd3 36285	. . . 4 ⊢ (𝑥 Bigcup 𝐵 ↔ 𝐵 = ∪ 𝑥)
22		eqcom 2776	. . . 4 ⊢ (𝐵 = ∪ 𝑥 ↔ ∪ 𝑥 = 𝐵)
23	21, 22	bitri 278	. . 3 ⊢ (𝑥 Bigcup 𝐵 ↔ ∪ 𝑥 = 𝐵)
24	8, 10, 23	vtoclbg 3533	. 2 ⊢ (𝐴 ∈ V → (𝐴 Bigcup 𝐵 ↔ ∪ 𝐴 = 𝐵))
25	2, 7, 24	pm5.21nii 381	1 ⊢ (𝐴 Bigcup 𝐵 ↔ ∪ 𝐴 = 𝐵)

Syntax hints:   ↔ wb 209   = wceq 1567   ∈ wcel 2149  ∃wrex 3095  Vcvv 3463  ∪ cuni 4876   class class class wbr 5113   E cep 5561   × cxp 5660   ∘ ccom 5666   Bigcup cbigcup 36223

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5261  ax-nul 5271  ax-pow 5337  ax-pr 5405  ax-un 7733

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-symdif 4214  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-br 5114  df-opab 5178  df-mpt 5197  df-id 5557  df-eprel 5562  df-xp 5668  df-rel 5669  df-cnv 5670  df-co 5671  df-dm 5672  df-rn 5673  df-res 5674  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-fo 6543  df-fv 6545  df-1st 7986  df-2nd 7987  df-txp 36243  df-bigcup 36247

This theorem is referenced by:  dfbigcup2  36288  fvbigcup  36291  ellimits  36299  brapply  36327  dfrdg4  36342