Theorem brbigcup 31175

Description: Binary relationship 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 31174	. . 3 ⊢ Rel Bigcup
2	1	brrelexi 5082	. 2 ⊢ (𝐴 Bigcup 𝐵 → 𝐴 ∈ V)
3		brbigcup.1	. . . 4 ⊢ 𝐵 ∈ V
4		eleq1 2676	. . . 4 ⊢ (∪ 𝐴 = 𝐵 → (∪ 𝐴 ∈ V ↔ 𝐵 ∈ V))
5	3, 4	mpbiri 247	. . 3 ⊢ (∪ 𝐴 = 𝐵 → ∪ 𝐴 ∈ V)
6		uniexb 6866	. . 3 ⊢ (𝐴 ∈ V ↔ ∪ 𝐴 ∈ V)
7	5, 6	sylibr 223	. 2 ⊢ (∪ 𝐴 = 𝐵 → 𝐴 ∈ V)
8		breq1 4586	. . 3 ⊢ (𝑥 = 𝐴 → (𝑥 Bigcup 𝐵 ↔ 𝐴 Bigcup 𝐵))
9		unieq 4380	. . . 4 ⊢ (𝑥 = 𝐴 → ∪ 𝑥 = ∪ 𝐴)
10	9	eqeq1d 2612	. . 3 ⊢ (𝑥 = 𝐴 → (∪ 𝑥 = 𝐵 ↔ ∪ 𝐴 = 𝐵))
11		vex 3176	. . . . 5 ⊢ 𝑥 ∈ V
12		df-bigcup 31134	. . . . 5 ⊢ Bigcup = ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ E ) ⊗ V)))
13		brxp 5071	. . . . . 6 ⊢ (𝑥(V × V)𝐵 ↔ (𝑥 ∈ V ∧ 𝐵 ∈ V))
14	11, 3, 13	mpbir2an 957	. . . . 5 ⊢ 𝑥(V × V)𝐵
15		epel 4952	. . . . . . 7 ⊢ (𝑦 E 𝑧 ↔ 𝑦 ∈ 𝑧)
16	15	rexbii 3023	. . . . . 6 ⊢ (∃𝑧 ∈ 𝑥 𝑦 E 𝑧 ↔ ∃𝑧 ∈ 𝑥 𝑦 ∈ 𝑧)
17		vex 3176	. . . . . . 7 ⊢ 𝑦 ∈ V
18	17, 11	coep 30894	. . . . . 6 ⊢ (𝑦( E ∘ E )𝑥 ↔ ∃𝑧 ∈ 𝑥 𝑦 E 𝑧)
19		eluni2 4376	. . . . . 6 ⊢ (𝑦 ∈ ∪ 𝑥 ↔ ∃𝑧 ∈ 𝑥 𝑦 ∈ 𝑧)
20	16, 18, 19	3bitr4ri 292	. . . . 5 ⊢ (𝑦 ∈ ∪ 𝑥 ↔ 𝑦( E ∘ E )𝑥)
21	11, 3, 12, 14, 20	brtxpsd3 31173	. . . 4 ⊢ (𝑥 Bigcup 𝐵 ↔ 𝐵 = ∪ 𝑥)
22		eqcom 2617	. . . 4 ⊢ (𝐵 = ∪ 𝑥 ↔ ∪ 𝑥 = 𝐵)
23	21, 22	bitri 263	. . 3 ⊢ (𝑥 Bigcup 𝐵 ↔ ∪ 𝑥 = 𝐵)
24	8, 10, 23	vtoclbg 3240	. 2 ⊢ (𝐴 ∈ V → (𝐴 Bigcup 𝐵 ↔ ∪ 𝐴 = 𝐵))
25	2, 7, 24	pm5.21nii 367	1 ⊢ (𝐴 Bigcup 𝐵 ↔ ∪ 𝐴 = 𝐵)

Syntax hints:   ↔ wb 195   = wceq 1475   ∈ wcel 1977  ∃wrex 2897  Vcvv 3173  ∪ cuni 4372   class class class wbr 4583   E cep 4947   × cxp 5036   ∘ ccom 5042   Bigcup cbigcup 31110

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-symdif 3806  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-br 4584  df-opab 4644  df-mpt 4645  df-eprel 4949  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-fo 5810  df-fv 5812  df-1st 7059  df-2nd 7060  df-txp 31130  df-bigcup 31134

This theorem is referenced by:  dfbigcup2  31176  fvbigcup  31179  ellimits  31187  brapply  31215  dfrdg4  31228