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Theorem djuun 9971
Description: The disjoint union of two classes is the union of the images of those two classes under right and left injection. (Contributed by Jim Kingdon, 22-Jun-2022.)
Assertion
Ref Expression
djuun ((inl “ 𝐴) ∪ (inr “ 𝐵)) = (𝐴𝐵)

Proof of Theorem djuun
Dummy variables 𝑥 𝑦 𝑢 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elun 4148 . . . 4 (𝑥 ∈ ((inl “ 𝐴) ∪ (inr “ 𝐵)) ↔ (𝑥 ∈ (inl “ 𝐴) ∨ 𝑥 ∈ (inr “ 𝐵)))
2 djulf1o 9957 . . . . . . . . . . 11 inl:V–1-1-onto→({∅} × V)
3 f1ofn 6846 . . . . . . . . . . 11 (inl:V–1-1-onto→({∅} × V) → inl Fn V)
42, 3ax-mp 5 . . . . . . . . . 10 inl Fn V
5 ssv 4004 . . . . . . . . . 10 𝐴 ⊆ V
6 fvelimab 6977 . . . . . . . . . 10 ((inl Fn V ∧ 𝐴 ⊆ V) → (𝑥 ∈ (inl “ 𝐴) ↔ ∃𝑢𝐴 (inl‘𝑢) = 𝑥))
74, 5, 6mp2an 690 . . . . . . . . 9 (𝑥 ∈ (inl “ 𝐴) ↔ ∃𝑢𝐴 (inl‘𝑢) = 𝑥)
87biimpi 215 . . . . . . . 8 (𝑥 ∈ (inl “ 𝐴) → ∃𝑢𝐴 (inl‘𝑢) = 𝑥)
9 simprr 771 . . . . . . . . 9 ((𝑥 ∈ (inl “ 𝐴) ∧ (𝑢𝐴 ∧ (inl‘𝑢) = 𝑥)) → (inl‘𝑢) = 𝑥)
10 vex 3466 . . . . . . . . . . 11 𝑢 ∈ V
11 opex 5472 . . . . . . . . . . 11 ⟨∅, 𝑢⟩ ∈ V
12 opeq2 4882 . . . . . . . . . . . 12 (𝑧 = 𝑢 → ⟨∅, 𝑧⟩ = ⟨∅, 𝑢⟩)
13 df-inl 9947 . . . . . . . . . . . 12 inl = (𝑧 ∈ V ↦ ⟨∅, 𝑧⟩)
1412, 13fvmptg 7009 . . . . . . . . . . 11 ((𝑢 ∈ V ∧ ⟨∅, 𝑢⟩ ∈ V) → (inl‘𝑢) = ⟨∅, 𝑢⟩)
1510, 11, 14mp2an 690 . . . . . . . . . 10 (inl‘𝑢) = ⟨∅, 𝑢
16 0ex 5314 . . . . . . . . . . . . 13 ∅ ∈ V
1716snid 4669 . . . . . . . . . . . 12 ∅ ∈ {∅}
18 opelxpi 5721 . . . . . . . . . . . 12 ((∅ ∈ {∅} ∧ 𝑢𝐴) → ⟨∅, 𝑢⟩ ∈ ({∅} × 𝐴))
1917, 18mpan 688 . . . . . . . . . . 11 (𝑢𝐴 → ⟨∅, 𝑢⟩ ∈ ({∅} × 𝐴))
2019ad2antrl 726 . . . . . . . . . 10 ((𝑥 ∈ (inl “ 𝐴) ∧ (𝑢𝐴 ∧ (inl‘𝑢) = 𝑥)) → ⟨∅, 𝑢⟩ ∈ ({∅} × 𝐴))
2115, 20eqeltrid 2830 . . . . . . . . 9 ((𝑥 ∈ (inl “ 𝐴) ∧ (𝑢𝐴 ∧ (inl‘𝑢) = 𝑥)) → (inl‘𝑢) ∈ ({∅} × 𝐴))
229, 21eqeltrrd 2827 . . . . . . . 8 ((𝑥 ∈ (inl “ 𝐴) ∧ (𝑢𝐴 ∧ (inl‘𝑢) = 𝑥)) → 𝑥 ∈ ({∅} × 𝐴))
238, 22rexlimddv 3151 . . . . . . 7 (𝑥 ∈ (inl “ 𝐴) → 𝑥 ∈ ({∅} × 𝐴))
24 elun1 4177 . . . . . . 7 (𝑥 ∈ ({∅} × 𝐴) → 𝑥 ∈ (({∅} × 𝐴) ∪ ({1o} × 𝐵)))
2523, 24syl 17 . . . . . 6 (𝑥 ∈ (inl “ 𝐴) → 𝑥 ∈ (({∅} × 𝐴) ∪ ({1o} × 𝐵)))
26 df-dju 9946 . . . . . 6 (𝐴𝐵) = (({∅} × 𝐴) ∪ ({1o} × 𝐵))
2725, 26eleqtrrdi 2837 . . . . 5 (𝑥 ∈ (inl “ 𝐴) → 𝑥 ∈ (𝐴𝐵))
28 djurf1o 9958 . . . . . . . . . . 11 inr:V–1-1-onto→({1o} × V)
29 f1ofn 6846 . . . . . . . . . . 11 (inr:V–1-1-onto→({1o} × V) → inr Fn V)
3028, 29ax-mp 5 . . . . . . . . . 10 inr Fn V
31 ssv 4004 . . . . . . . . . 10 𝐵 ⊆ V
32 fvelimab 6977 . . . . . . . . . 10 ((inr Fn V ∧ 𝐵 ⊆ V) → (𝑥 ∈ (inr “ 𝐵) ↔ ∃𝑢𝐵 (inr‘𝑢) = 𝑥))
3330, 31, 32mp2an 690 . . . . . . . . 9 (𝑥 ∈ (inr “ 𝐵) ↔ ∃𝑢𝐵 (inr‘𝑢) = 𝑥)
3433biimpi 215 . . . . . . . 8 (𝑥 ∈ (inr “ 𝐵) → ∃𝑢𝐵 (inr‘𝑢) = 𝑥)
35 simprr 771 . . . . . . . . 9 ((𝑥 ∈ (inr “ 𝐵) ∧ (𝑢𝐵 ∧ (inr‘𝑢) = 𝑥)) → (inr‘𝑢) = 𝑥)
36 opex 5472 . . . . . . . . . . 11 ⟨1o, 𝑢⟩ ∈ V
37 opeq2 4882 . . . . . . . . . . . 12 (𝑧 = 𝑢 → ⟨1o, 𝑧⟩ = ⟨1o, 𝑢⟩)
38 df-inr 9948 . . . . . . . . . . . 12 inr = (𝑧 ∈ V ↦ ⟨1o, 𝑧⟩)
3937, 38fvmptg 7009 . . . . . . . . . . 11 ((𝑢 ∈ V ∧ ⟨1o, 𝑢⟩ ∈ V) → (inr‘𝑢) = ⟨1o, 𝑢⟩)
4010, 36, 39mp2an 690 . . . . . . . . . 10 (inr‘𝑢) = ⟨1o, 𝑢
41 1oex 8508 . . . . . . . . . . . . 13 1o ∈ V
4241snid 4669 . . . . . . . . . . . 12 1o ∈ {1o}
43 opelxpi 5721 . . . . . . . . . . . 12 ((1o ∈ {1o} ∧ 𝑢𝐵) → ⟨1o, 𝑢⟩ ∈ ({1o} × 𝐵))
4442, 43mpan 688 . . . . . . . . . . 11 (𝑢𝐵 → ⟨1o, 𝑢⟩ ∈ ({1o} × 𝐵))
4544ad2antrl 726 . . . . . . . . . 10 ((𝑥 ∈ (inr “ 𝐵) ∧ (𝑢𝐵 ∧ (inr‘𝑢) = 𝑥)) → ⟨1o, 𝑢⟩ ∈ ({1o} × 𝐵))
4640, 45eqeltrid 2830 . . . . . . . . 9 ((𝑥 ∈ (inr “ 𝐵) ∧ (𝑢𝐵 ∧ (inr‘𝑢) = 𝑥)) → (inr‘𝑢) ∈ ({1o} × 𝐵))
4735, 46eqeltrrd 2827 . . . . . . . 8 ((𝑥 ∈ (inr “ 𝐵) ∧ (𝑢𝐵 ∧ (inr‘𝑢) = 𝑥)) → 𝑥 ∈ ({1o} × 𝐵))
4834, 47rexlimddv 3151 . . . . . . 7 (𝑥 ∈ (inr “ 𝐵) → 𝑥 ∈ ({1o} × 𝐵))
49 elun2 4178 . . . . . . 7 (𝑥 ∈ ({1o} × 𝐵) → 𝑥 ∈ (({∅} × 𝐴) ∪ ({1o} × 𝐵)))
5048, 49syl 17 . . . . . 6 (𝑥 ∈ (inr “ 𝐵) → 𝑥 ∈ (({∅} × 𝐴) ∪ ({1o} × 𝐵)))
5150, 26eleqtrrdi 2837 . . . . 5 (𝑥 ∈ (inr “ 𝐵) → 𝑥 ∈ (𝐴𝐵))
5227, 51jaoi 855 . . . 4 ((𝑥 ∈ (inl “ 𝐴) ∨ 𝑥 ∈ (inr “ 𝐵)) → 𝑥 ∈ (𝐴𝐵))
531, 52sylbi 216 . . 3 (𝑥 ∈ ((inl “ 𝐴) ∪ (inr “ 𝐵)) → 𝑥 ∈ (𝐴𝐵))
5453ssriv 3983 . 2 ((inl “ 𝐴) ∪ (inr “ 𝐵)) ⊆ (𝐴𝐵)
55 djur 9964 . . . . 5 (𝑥 ∈ (𝐴𝐵) → (∃𝑦𝐴 𝑥 = (inl‘𝑦) ∨ ∃𝑦𝐵 𝑥 = (inr‘𝑦)))
56 vex 3466 . . . . . . . . . 10 𝑦 ∈ V
57 f1odm 6849 . . . . . . . . . . 11 (inl:V–1-1-onto→({∅} × V) → dom inl = V)
582, 57ax-mp 5 . . . . . . . . . 10 dom inl = V
5956, 58eleqtrri 2825 . . . . . . . . 9 𝑦 ∈ dom inl
60 simpl 481 . . . . . . . . 9 ((𝑦𝐴𝑥 = (inl‘𝑦)) → 𝑦𝐴)
6113funmpt2 6600 . . . . . . . . . 10 Fun inl
62 funfvima 7249 . . . . . . . . . 10 ((Fun inl ∧ 𝑦 ∈ dom inl) → (𝑦𝐴 → (inl‘𝑦) ∈ (inl “ 𝐴)))
6361, 62mpan 688 . . . . . . . . 9 (𝑦 ∈ dom inl → (𝑦𝐴 → (inl‘𝑦) ∈ (inl “ 𝐴)))
6459, 60, 63mpsyl 68 . . . . . . . 8 ((𝑦𝐴𝑥 = (inl‘𝑦)) → (inl‘𝑦) ∈ (inl “ 𝐴))
65 eleq1 2814 . . . . . . . . 9 (𝑥 = (inl‘𝑦) → (𝑥 ∈ (inl “ 𝐴) ↔ (inl‘𝑦) ∈ (inl “ 𝐴)))
6665adantl 480 . . . . . . . 8 ((𝑦𝐴𝑥 = (inl‘𝑦)) → (𝑥 ∈ (inl “ 𝐴) ↔ (inl‘𝑦) ∈ (inl “ 𝐴)))
6764, 66mpbird 256 . . . . . . 7 ((𝑦𝐴𝑥 = (inl‘𝑦)) → 𝑥 ∈ (inl “ 𝐴))
6867rexlimiva 3137 . . . . . 6 (∃𝑦𝐴 𝑥 = (inl‘𝑦) → 𝑥 ∈ (inl “ 𝐴))
69 f1odm 6849 . . . . . . . . . . 11 (inr:V–1-1-onto→({1o} × V) → dom inr = V)
7028, 69ax-mp 5 . . . . . . . . . 10 dom inr = V
7156, 70eleqtrri 2825 . . . . . . . . 9 𝑦 ∈ dom inr
72 simpl 481 . . . . . . . . 9 ((𝑦𝐵𝑥 = (inr‘𝑦)) → 𝑦𝐵)
73 f1ofun 6847 . . . . . . . . . . 11 (inr:V–1-1-onto→({1o} × V) → Fun inr)
7428, 73ax-mp 5 . . . . . . . . . 10 Fun inr
75 funfvima 7249 . . . . . . . . . 10 ((Fun inr ∧ 𝑦 ∈ dom inr) → (𝑦𝐵 → (inr‘𝑦) ∈ (inr “ 𝐵)))
7674, 75mpan 688 . . . . . . . . 9 (𝑦 ∈ dom inr → (𝑦𝐵 → (inr‘𝑦) ∈ (inr “ 𝐵)))
7771, 72, 76mpsyl 68 . . . . . . . 8 ((𝑦𝐵𝑥 = (inr‘𝑦)) → (inr‘𝑦) ∈ (inr “ 𝐵))
78 eleq1 2814 . . . . . . . . 9 (𝑥 = (inr‘𝑦) → (𝑥 ∈ (inr “ 𝐵) ↔ (inr‘𝑦) ∈ (inr “ 𝐵)))
7978adantl 480 . . . . . . . 8 ((𝑦𝐵𝑥 = (inr‘𝑦)) → (𝑥 ∈ (inr “ 𝐵) ↔ (inr‘𝑦) ∈ (inr “ 𝐵)))
8077, 79mpbird 256 . . . . . . 7 ((𝑦𝐵𝑥 = (inr‘𝑦)) → 𝑥 ∈ (inr “ 𝐵))
8180rexlimiva 3137 . . . . . 6 (∃𝑦𝐵 𝑥 = (inr‘𝑦) → 𝑥 ∈ (inr “ 𝐵))
8268, 81orim12i 906 . . . . 5 ((∃𝑦𝐴 𝑥 = (inl‘𝑦) ∨ ∃𝑦𝐵 𝑥 = (inr‘𝑦)) → (𝑥 ∈ (inl “ 𝐴) ∨ 𝑥 ∈ (inr “ 𝐵)))
8355, 82syl 17 . . . 4 (𝑥 ∈ (𝐴𝐵) → (𝑥 ∈ (inl “ 𝐴) ∨ 𝑥 ∈ (inr “ 𝐵)))
8483, 1sylibr 233 . . 3 (𝑥 ∈ (𝐴𝐵) → 𝑥 ∈ ((inl “ 𝐴) ∪ (inr “ 𝐵)))
8584ssriv 3983 . 2 (𝐴𝐵) ⊆ ((inl “ 𝐴) ∪ (inr “ 𝐵))
8654, 85eqssi 3996 1 ((inl “ 𝐴) ∪ (inr “ 𝐵)) = (𝐴𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wa 394  wo 845   = wceq 1534  wcel 2099  wrex 3060  Vcvv 3462  cun 3945  wss 3947  c0 4325  {csn 4633  cop 4639   × cxp 5682  dom cdm 5684  cima 5687  Fun wfun 6550   Fn wfn 6551  1-1-ontowf1o 6555  cfv 6556  1oc1o 8491  cdju 9943  inlcinl 9944  inrcinr 9945
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2697  ax-sep 5306  ax-nul 5313  ax-pr 5435  ax-un 7748
This theorem depends on definitions:  df-bi 206  df-an 395  df-or 846  df-3or 1085  df-3an 1086  df-tru 1537  df-fal 1547  df-ex 1775  df-nf 1779  df-sb 2061  df-mo 2529  df-eu 2558  df-clab 2704  df-cleq 2718  df-clel 2803  df-nfc 2878  df-ne 2931  df-ral 3052  df-rex 3061  df-rab 3420  df-v 3464  df-dif 3950  df-un 3952  df-in 3954  df-ss 3964  df-pss 3967  df-nul 4326  df-if 4534  df-pw 4609  df-sn 4634  df-pr 4636  df-op 4640  df-uni 4916  df-br 5156  df-opab 5218  df-mpt 5239  df-tr 5273  df-id 5582  df-eprel 5588  df-po 5596  df-so 5597  df-fr 5639  df-we 5641  df-xp 5690  df-rel 5691  df-cnv 5692  df-co 5693  df-dm 5694  df-rn 5695  df-res 5696  df-ima 5697  df-ord 6381  df-on 6382  df-lim 6383  df-suc 6384  df-iota 6508  df-fun 6558  df-fn 6559  df-f 6560  df-f1 6561  df-fo 6562  df-f1o 6563  df-fv 6564  df-om 7879  df-1st 8005  df-2nd 8006  df-1o 8498  df-dju 9946  df-inl 9947  df-inr 9948
This theorem is referenced by: (None)
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