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Theorem endjudisj 7415
Description: Equinumerosity of a disjoint union and a union of two disjoint sets. (Contributed by Jim Kingdon, 30-Jul-2023.)
Assertion
Ref Expression
endjudisj ((𝐴𝑉𝐵𝑊 ∧ (𝐴𝐵) = ∅) → (𝐴𝐵) ≈ (𝐴𝐵))

Proof of Theorem endjudisj
StepHypRef Expression
1 djuun 7257 . 2 ((inl “ 𝐴) ∪ (inr “ 𝐵)) = (𝐴𝐵)
2 eninl 7287 . . . 4 (𝐴𝑉 → (inl “ 𝐴) ≈ 𝐴)
323ad2ant1 1042 . . 3 ((𝐴𝑉𝐵𝑊 ∧ (𝐴𝐵) = ∅) → (inl “ 𝐴) ≈ 𝐴)
4 eninr 7288 . . . 4 (𝐵𝑊 → (inr “ 𝐵) ≈ 𝐵)
543ad2ant2 1043 . . 3 ((𝐴𝑉𝐵𝑊 ∧ (𝐴𝐵) = ∅) → (inr “ 𝐵) ≈ 𝐵)
6 djuin 7254 . . . 4 ((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅
76a1i 9 . . 3 ((𝐴𝑉𝐵𝑊 ∧ (𝐴𝐵) = ∅) → ((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅)
8 simp3 1023 . . 3 ((𝐴𝑉𝐵𝑊 ∧ (𝐴𝐵) = ∅) → (𝐴𝐵) = ∅)
9 unen 6986 . . 3 ((((inl “ 𝐴) ≈ 𝐴 ∧ (inr “ 𝐵) ≈ 𝐵) ∧ (((inl “ 𝐴) ∩ (inr “ 𝐵)) = ∅ ∧ (𝐴𝐵) = ∅)) → ((inl “ 𝐴) ∪ (inr “ 𝐵)) ≈ (𝐴𝐵))
103, 5, 7, 8, 9syl22anc 1272 . 2 ((𝐴𝑉𝐵𝑊 ∧ (𝐴𝐵) = ∅) → ((inl “ 𝐴) ∪ (inr “ 𝐵)) ≈ (𝐴𝐵))
111, 10eqbrtrrid 4122 1 ((𝐴𝑉𝐵𝑊 ∧ (𝐴𝐵) = ∅) → (𝐴𝐵) ≈ (𝐴𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  w3a 1002   = wceq 1395  wcel 2200  cun 3196  cin 3197  c0 3492   class class class wbr 4086  cima 4726  cen 6902  cdju 7227  inlcinl 7235  inrcinr 7236
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-coll 4202  ax-sep 4205  ax-nul 4213  ax-pow 4262  ax-pr 4297  ax-un 4528
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-reu 2515  df-rab 2517  df-v 2802  df-sbc 3030  df-csb 3126  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-nul 3493  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-iun 3970  df-br 4087  df-opab 4149  df-mpt 4150  df-tr 4186  df-id 4388  df-iord 4461  df-on 4463  df-suc 4466  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-rn 4734  df-res 4735  df-ima 4736  df-iota 5284  df-fun 5326  df-fn 5327  df-f 5328  df-f1 5329  df-fo 5330  df-f1o 5331  df-fv 5332  df-1st 6298  df-2nd 6299  df-1o 6577  df-er 6697  df-en 6905  df-dju 7228  df-inl 7237  df-inr 7238
This theorem is referenced by:  djuenun  7417  dju0en  7419  exmidunben  13037
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