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Theorem brbigcup 36124
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.
StepHypRef Expression
1 relbigcup 36123 . . 3 Rel Bigcup
21brrelex1i 5674 . 2 (𝐴 Bigcup 𝐵𝐴 ∈ V)
3 brbigcup.1 . . . 4 𝐵 ∈ V
4 eleq1 2827 . . . 4 ( 𝐴 = 𝐵 → ( 𝐴 ∈ V ↔ 𝐵 ∈ V))
53, 4mpbiri 259 . . 3 ( 𝐴 = 𝐵 𝐴 ∈ V)
6 uniexb 7707 . . 3 (𝐴 ∈ V ↔ 𝐴 ∈ V)
75, 6sylibr 235 . 2 ( 𝐴 = 𝐵𝐴 ∈ V)
8 breq1 5075 . . 3 (𝑥 = 𝐴 → (𝑥 Bigcup 𝐵𝐴 Bigcup 𝐵))
9 unieq 4849 . . . 4 (𝑥 = 𝐴 𝑥 = 𝐴)
109eqeq1d 2741 . . 3 (𝑥 = 𝐴 → ( 𝑥 = 𝐵 𝐴 = 𝐵))
11 vex 3435 . . . . 5 𝑥 ∈ V
12 df-bigcup 36084 . . . . 5 Bigcup = ((V × V) ∖ ran ((V ⊗ E ) △ (( E ∘ E ) ⊗ V)))
13 brxp 5667 . . . . . 6 (𝑥(V × V)𝐵 ↔ (𝑥 ∈ V ∧ 𝐵 ∈ V))
1411, 3, 13mpbir2an 717 . . . . 5 𝑥(V × V)𝐵
15 epel 5521 . . . . . . 7 (𝑦 E 𝑧𝑦𝑧)
1615rexbii 3086 . . . . . 6 (∃𝑧𝑥 𝑦 E 𝑧 ↔ ∃𝑧𝑥 𝑦𝑧)
17 vex 3435 . . . . . . 7 𝑦 ∈ V
1817, 11coep 35980 . . . . . 6 (𝑦( E ∘ E )𝑥 ↔ ∃𝑧𝑥 𝑦 E 𝑧)
19 eluni2 4842 . . . . . 6 (𝑦 𝑥 ↔ ∃𝑧𝑥 𝑦𝑧)
2016, 18, 193bitr4ri 305 . . . . 5 (𝑦 𝑥𝑦( E ∘ E )𝑥)
2111, 3, 12, 14, 20brtxpsd3 36122 . . . 4 (𝑥 Bigcup 𝐵𝐵 = 𝑥)
22 eqcom 2746 . . . 4 (𝐵 = 𝑥 𝑥 = 𝐵)
2321, 22bitri 276 . . 3 (𝑥 Bigcup 𝐵 𝑥 = 𝐵)
248, 10, 23vtoclbg 3502 . 2 (𝐴 ∈ V → (𝐴 Bigcup 𝐵 𝐴 = 𝐵))
252, 7, 24pm5.21nii 379 1 (𝐴 Bigcup 𝐵 𝐴 = 𝐵)
Colors of variables: wff setvar class
Syntax hints:  wb 207   = wceq 1547  wcel 2119  wrex 3063  Vcvv 3431   cuni 4838   class class class wbr 5072   E cep 5517   × cxp 5616  ccom 5622   Bigcup cbigcup 36060
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2711  ax-sep 5218  ax-nul 5228  ax-pow 5294  ax-pr 5362  ax-un 7678
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2718  df-cleq 2731  df-clel 2814  df-nfc 2888  df-ne 2935  df-ral 3054  df-rex 3064  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-symdif 4181  df-nul 4262  df-if 4455  df-pw 4531  df-sn 4556  df-pr 4558  df-op 4562  df-uni 4839  df-br 5073  df-opab 5135  df-mpt 5154  df-id 5513  df-eprel 5518  df-xp 5624  df-rel 5625  df-cnv 5626  df-co 5627  df-dm 5628  df-rn 5629  df-res 5630  df-iota 6441  df-fun 6487  df-fn 6488  df-f 6489  df-fo 6491  df-fv 6493  df-1st 7931  df-2nd 7932  df-txp 36080  df-bigcup 36084
This theorem is referenced by:  dfbigcup2  36125  fvbigcup  36128  ellimits  36136  brapply  36164  dfrdg4  36179
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