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Theorem otexg 4346
Description: An ordered triple of sets is a set. (Contributed by Jim Kingdon, 19-Sep-2018.)
Assertion
Ref Expression
otexg ((𝐴𝑈𝐵𝑉𝐶𝑊) → ⟨𝐴, 𝐵, 𝐶⟩ ∈ V)

Proof of Theorem otexg
StepHypRef Expression
1 df-ot 3699 . . 3 𝐴, 𝐵, 𝐶⟩ = ⟨⟨𝐴, 𝐵⟩, 𝐶
2 opexg 4344 . . . 4 ((𝐴𝑈𝐵𝑉) → ⟨𝐴, 𝐵⟩ ∈ V)
3 opexg 4344 . . . 4 ((⟨𝐴, 𝐵⟩ ∈ V ∧ 𝐶𝑊) → ⟨⟨𝐴, 𝐵⟩, 𝐶⟩ ∈ V)
42, 3sylan 283 . . 3 (((𝐴𝑈𝐵𝑉) ∧ 𝐶𝑊) → ⟨⟨𝐴, 𝐵⟩, 𝐶⟩ ∈ V)
51, 4eqeltrid 2319 . 2 (((𝐴𝑈𝐵𝑉) ∧ 𝐶𝑊) → ⟨𝐴, 𝐵, 𝐶⟩ ∈ V)
653impa 1221 1 ((𝐴𝑈𝐵𝑉𝐶𝑊) → ⟨𝐴, 𝐵, 𝐶⟩ ∈ V)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  w3a 1005  wcel 2203  Vcvv 2813  cop 3692  cotp 3693
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-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-ot 3699
This theorem is referenced by:  euotd  4371
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