Theorem brbigcup 36660

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 36659	. . 3 ⊢ Rel Bigcup
2	1	brrelex1i 5707	. 2 ⊢ (𝐴 Bigcup 𝐵 → 𝐴 ∈ V)
3		brbigcup.1	. . . 4 ⊢ 𝐵 ∈ V
4		eleq1 2849	. . . 4 ⊢ (∪ 𝐴 = 𝐵 → (∪ 𝐴 ∈ V ↔ 𝐵 ∈ V))
5	3, 4	mpbiri 261	. . 3 ⊢ (∪ 𝐴 = 𝐵 → ∪ 𝐴 ∈ V)
6		uniexb 7778	. . 3 ⊢ (𝐴 ∈ V ↔ ∪ 𝐴 ∈ V)
7	5, 6	sylibr 237	. 2 ⊢ (∪ 𝐴 = 𝐵 → 𝐴 ∈ V)
8		breq1 5106	. . 3 ⊢ (𝑥 = 𝐴 → (𝑥 Bigcup 𝐵 ↔ 𝐴 Bigcup 𝐵))
9		unieq 4878	. . . 4 ⊢ (𝑥 = 𝐴 → ∪ 𝑥 = ∪ 𝐴)
10	9	eqeq1d 2763	. . 3 ⊢ (𝑥 = 𝐴 → (∪ 𝑥 = 𝐵 ↔ ∪ 𝐴 = 𝐵))
11		vex 3455	. . . . 5 ⊢ 𝑥 ∈ V
12		df-bigcup 36620	. . . . 5 ⊢ Bigcup = ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ E ) ⊗ V)))
13		brxp 5700	. . . . . 6 ⊢ (𝑥(V × V)𝐵 ↔ (𝑥 ∈ V ∧ 𝐵 ∈ V))
14	11, 3, 13	mpbir2an 724	. . . . 5 ⊢ 𝑥(V × V)𝐵
15		epel 5554	. . . . . . 7 ⊢ (𝑦 E 𝑧 ↔ 𝑦 ∈ 𝑧)
16	15	rexbii 3110	. . . . . 6 ⊢ (∃𝑧 ∈ 𝑥 𝑦 E 𝑧 ↔ ∃𝑧 ∈ 𝑥 𝑦 ∈ 𝑧)
17		vex 3455	. . . . . . 7 ⊢ 𝑦 ∈ V
18	17, 11	coep 36517	. . . . . 6 ⊢ (𝑦( E ∘ E )𝑥 ↔ ∃𝑧 ∈ 𝑥 𝑦 E 𝑧)
19		eluni2 4871	. . . . . 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 36658	. . . 4 ⊢ (𝑥 Bigcup 𝐵 ↔ 𝐵 = ∪ 𝑥)
22		eqcom 2768	. . . 4 ⊢ (𝐵 = ∪ 𝑥 ↔ ∪ 𝑥 = 𝐵)
23	21, 22	bitri 278	. . 3 ⊢ (𝑥 Bigcup 𝐵 ↔ ∪ 𝑥 = 𝐵)
24	8, 10, 23	vtoclbg 3520	. 2 ⊢ (𝐴 ∈ V → (𝐴 Bigcup 𝐵 ↔ ∪ 𝐴 = 𝐵))
25	2, 7, 24	pm5.21nii 381	1 ⊢ (𝐴 Bigcup 𝐵 ↔ ∪ 𝐴 = 𝐵)

This proof depends on syntax axioms:   ↔ wb 209   = wceq 1570   ∈ wcel 2145  ∃wrex 3087  Vcvv 3451  ∪ cuni 4867   class class class wbr 5103   E cep 5550   × cxp 5649   ∘ ccom 5655   Bigcup cbigcup 36596

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pow 5327  ax-pr 5391  ax-un 7751

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-symdif 4199  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-eprel 5551  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-fo 6544  df-fv 6546  df-1st 8001  df-2nd 8002  df-txp 36616  df-bigcup 36620

This theorem is used by:  dfbigcup2  36661  fvbigcup  36664  ellimits  36672  brapply  36700  dfrdg4  36715