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Theorem uniuni 4436
Description: Expression for double union that moves union into a class builder. (Contributed by FL, 28-May-2007.)
Assertion
Ref Expression
uniuni 𝐴 = {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)}
Distinct variable group:   𝑥,𝐴,𝑦

Proof of Theorem uniuni
Dummy variables 𝑣 𝑧 𝑢 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eluni 3799 . . . . . 6 (𝑢 𝐴 ↔ ∃𝑦(𝑢𝑦𝑦𝐴))
21anbi2i 454 . . . . 5 ((𝑧𝑢𝑢 𝐴) ↔ (𝑧𝑢 ∧ ∃𝑦(𝑢𝑦𝑦𝐴)))
32exbii 1598 . . . 4 (∃𝑢(𝑧𝑢𝑢 𝐴) ↔ ∃𝑢(𝑧𝑢 ∧ ∃𝑦(𝑢𝑦𝑦𝐴)))
4 19.42v 1899 . . . . . . 7 (∃𝑦(𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)) ↔ (𝑧𝑢 ∧ ∃𝑦(𝑢𝑦𝑦𝐴)))
54bicomi 131 . . . . . 6 ((𝑧𝑢 ∧ ∃𝑦(𝑢𝑦𝑦𝐴)) ↔ ∃𝑦(𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)))
65exbii 1598 . . . . 5 (∃𝑢(𝑧𝑢 ∧ ∃𝑦(𝑢𝑦𝑦𝐴)) ↔ ∃𝑢𝑦(𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)))
7 excom 1657 . . . . . 6 (∃𝑢𝑦(𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)) ↔ ∃𝑦𝑢(𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)))
8 anass 399 . . . . . . . 8 (((𝑧𝑢𝑢𝑦) ∧ 𝑦𝐴) ↔ (𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)))
9 ancom 264 . . . . . . . 8 (((𝑧𝑢𝑢𝑦) ∧ 𝑦𝐴) ↔ (𝑦𝐴 ∧ (𝑧𝑢𝑢𝑦)))
108, 9bitr3i 185 . . . . . . 7 ((𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)) ↔ (𝑦𝐴 ∧ (𝑧𝑢𝑢𝑦)))
11102exbii 1599 . . . . . 6 (∃𝑦𝑢(𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)) ↔ ∃𝑦𝑢(𝑦𝐴 ∧ (𝑧𝑢𝑢𝑦)))
12 exdistr 1902 . . . . . 6 (∃𝑦𝑢(𝑦𝐴 ∧ (𝑧𝑢𝑢𝑦)) ↔ ∃𝑦(𝑦𝐴 ∧ ∃𝑢(𝑧𝑢𝑢𝑦)))
137, 11, 123bitri 205 . . . . 5 (∃𝑢𝑦(𝑧𝑢 ∧ (𝑢𝑦𝑦𝐴)) ↔ ∃𝑦(𝑦𝐴 ∧ ∃𝑢(𝑧𝑢𝑢𝑦)))
14 eluni 3799 . . . . . . . 8 (𝑧 𝑦 ↔ ∃𝑢(𝑧𝑢𝑢𝑦))
1514bicomi 131 . . . . . . 7 (∃𝑢(𝑧𝑢𝑢𝑦) ↔ 𝑧 𝑦)
1615anbi2i 454 . . . . . 6 ((𝑦𝐴 ∧ ∃𝑢(𝑧𝑢𝑢𝑦)) ↔ (𝑦𝐴𝑧 𝑦))
1716exbii 1598 . . . . 5 (∃𝑦(𝑦𝐴 ∧ ∃𝑢(𝑧𝑢𝑢𝑦)) ↔ ∃𝑦(𝑦𝐴𝑧 𝑦))
186, 13, 173bitri 205 . . . 4 (∃𝑢(𝑧𝑢 ∧ ∃𝑦(𝑢𝑦𝑦𝐴)) ↔ ∃𝑦(𝑦𝐴𝑧 𝑦))
19 vex 2733 . . . . . . . . . . 11 𝑦 ∈ V
2019uniex 4422 . . . . . . . . . 10 𝑦 ∈ V
21 eleq2 2234 . . . . . . . . . 10 (𝑣 = 𝑦 → (𝑧𝑣𝑧 𝑦))
2220, 21ceqsexv 2769 . . . . . . . . 9 (∃𝑣(𝑣 = 𝑦𝑧𝑣) ↔ 𝑧 𝑦)
23 exancom 1601 . . . . . . . . 9 (∃𝑣(𝑣 = 𝑦𝑧𝑣) ↔ ∃𝑣(𝑧𝑣𝑣 = 𝑦))
2422, 23bitr3i 185 . . . . . . . 8 (𝑧 𝑦 ↔ ∃𝑣(𝑧𝑣𝑣 = 𝑦))
2524anbi2i 454 . . . . . . 7 ((𝑦𝐴𝑧 𝑦) ↔ (𝑦𝐴 ∧ ∃𝑣(𝑧𝑣𝑣 = 𝑦)))
26 19.42v 1899 . . . . . . 7 (∃𝑣(𝑦𝐴 ∧ (𝑧𝑣𝑣 = 𝑦)) ↔ (𝑦𝐴 ∧ ∃𝑣(𝑧𝑣𝑣 = 𝑦)))
27 ancom 264 . . . . . . . . 9 ((𝑦𝐴 ∧ (𝑧𝑣𝑣 = 𝑦)) ↔ ((𝑧𝑣𝑣 = 𝑦) ∧ 𝑦𝐴))
28 anass 399 . . . . . . . . 9 (((𝑧𝑣𝑣 = 𝑦) ∧ 𝑦𝐴) ↔ (𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)))
2927, 28bitri 183 . . . . . . . 8 ((𝑦𝐴 ∧ (𝑧𝑣𝑣 = 𝑦)) ↔ (𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)))
3029exbii 1598 . . . . . . 7 (∃𝑣(𝑦𝐴 ∧ (𝑧𝑣𝑣 = 𝑦)) ↔ ∃𝑣(𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)))
3125, 26, 303bitr2i 207 . . . . . 6 ((𝑦𝐴𝑧 𝑦) ↔ ∃𝑣(𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)))
3231exbii 1598 . . . . 5 (∃𝑦(𝑦𝐴𝑧 𝑦) ↔ ∃𝑦𝑣(𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)))
33 excom 1657 . . . . 5 (∃𝑦𝑣(𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)) ↔ ∃𝑣𝑦(𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)))
34 exdistr 1902 . . . . . 6 (∃𝑣𝑦(𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)) ↔ ∃𝑣(𝑧𝑣 ∧ ∃𝑦(𝑣 = 𝑦𝑦𝐴)))
35 vex 2733 . . . . . . . . . 10 𝑣 ∈ V
36 eqeq1 2177 . . . . . . . . . . . 12 (𝑥 = 𝑣 → (𝑥 = 𝑦𝑣 = 𝑦))
3736anbi1d 462 . . . . . . . . . . 11 (𝑥 = 𝑣 → ((𝑥 = 𝑦𝑦𝐴) ↔ (𝑣 = 𝑦𝑦𝐴)))
3837exbidv 1818 . . . . . . . . . 10 (𝑥 = 𝑣 → (∃𝑦(𝑥 = 𝑦𝑦𝐴) ↔ ∃𝑦(𝑣 = 𝑦𝑦𝐴)))
3935, 38elab 2874 . . . . . . . . 9 (𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)} ↔ ∃𝑦(𝑣 = 𝑦𝑦𝐴))
4039bicomi 131 . . . . . . . 8 (∃𝑦(𝑣 = 𝑦𝑦𝐴) ↔ 𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)})
4140anbi2i 454 . . . . . . 7 ((𝑧𝑣 ∧ ∃𝑦(𝑣 = 𝑦𝑦𝐴)) ↔ (𝑧𝑣𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)}))
4241exbii 1598 . . . . . 6 (∃𝑣(𝑧𝑣 ∧ ∃𝑦(𝑣 = 𝑦𝑦𝐴)) ↔ ∃𝑣(𝑧𝑣𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)}))
4334, 42bitri 183 . . . . 5 (∃𝑣𝑦(𝑧𝑣 ∧ (𝑣 = 𝑦𝑦𝐴)) ↔ ∃𝑣(𝑧𝑣𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)}))
4432, 33, 433bitri 205 . . . 4 (∃𝑦(𝑦𝐴𝑧 𝑦) ↔ ∃𝑣(𝑧𝑣𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)}))
453, 18, 443bitri 205 . . 3 (∃𝑢(𝑧𝑢𝑢 𝐴) ↔ ∃𝑣(𝑧𝑣𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)}))
4645abbii 2286 . 2 {𝑧 ∣ ∃𝑢(𝑧𝑢𝑢 𝐴)} = {𝑧 ∣ ∃𝑣(𝑧𝑣𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)})}
47 df-uni 3797 . 2 𝐴 = {𝑧 ∣ ∃𝑢(𝑧𝑢𝑢 𝐴)}
48 df-uni 3797 . 2 {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)} = {𝑧 ∣ ∃𝑣(𝑧𝑣𝑣 ∈ {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)})}
4946, 47, 483eqtr4i 2201 1 𝐴 = {𝑥 ∣ ∃𝑦(𝑥 = 𝑦𝑦𝐴)}
Colors of variables: wff set class
Syntax hints:  wa 103   = wceq 1348  wex 1485  wcel 2141  {cab 2156   cuni 3796
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-sep 4107  ax-un 4418
This theorem depends on definitions:  df-bi 116  df-tru 1351  df-nf 1454  df-sb 1756  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-rex 2454  df-v 2732  df-uni 3797
This theorem is referenced by: (None)
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