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Theorem otexg 4147
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 3532 . . 3 𝐴, 𝐵, 𝐶⟩ = ⟨⟨𝐴, 𝐵⟩, 𝐶
2 opexg 4145 . . . 4 ((𝐴𝑈𝐵𝑉) → ⟨𝐴, 𝐵⟩ ∈ V)
3 opexg 4145 . . . 4 ((⟨𝐴, 𝐵⟩ ∈ V ∧ 𝐶𝑊) → ⟨⟨𝐴, 𝐵⟩, 𝐶⟩ ∈ V)
42, 3sylan 281 . . 3 (((𝐴𝑈𝐵𝑉) ∧ 𝐶𝑊) → ⟨⟨𝐴, 𝐵⟩, 𝐶⟩ ∈ V)
51, 4eqeltrid 2224 . 2 (((𝐴𝑈𝐵𝑉) ∧ 𝐶𝑊) → ⟨𝐴, 𝐵, 𝐶⟩ ∈ V)
653impa 1176 1 ((𝐴𝑈𝐵𝑉𝐶𝑊) → ⟨𝐴, 𝐵, 𝐶⟩ ∈ V)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103  w3a 962  wcel 1480  Vcvv 2681  cop 3525  cotp 3526
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 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2119  ax-sep 4041  ax-pow 4093  ax-pr 4126
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-nf 1437  df-sb 1736  df-clab 2124  df-cleq 2130  df-clel 2133  df-nfc 2268  df-v 2683  df-un 3070  df-in 3072  df-ss 3079  df-pw 3507  df-sn 3528  df-pr 3529  df-op 3531  df-ot 3532
This theorem is referenced by:  euotd  4171
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