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Theorem otexg 3967
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 3385 . . 3 𝐴, 𝐵, 𝐶⟩ = ⟨⟨𝐴, 𝐵⟩, 𝐶
2 opexg 3964 . . . 4 ((𝐴𝑈𝐵𝑉) → ⟨𝐴, 𝐵⟩ ∈ V)
3 opexg 3964 . . . 4 ((⟨𝐴, 𝐵⟩ ∈ V ∧ 𝐶𝑊) → ⟨⟨𝐴, 𝐵⟩, 𝐶⟩ ∈ V)
42, 3sylan 267 . . 3 (((𝐴𝑈𝐵𝑉) ∧ 𝐶𝑊) → ⟨⟨𝐴, 𝐵⟩, 𝐶⟩ ∈ V)
51, 4syl5eqel 2124 . 2 (((𝐴𝑈𝐵𝑉) ∧ 𝐶𝑊) → ⟨𝐴, 𝐵, 𝐶⟩ ∈ V)
653impa 1099 1 ((𝐴𝑈𝐵𝑉𝐶𝑊) → ⟨𝐴, 𝐵, 𝐶⟩ ∈ V)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 97  w3a 885  wcel 1393  Vcvv 2557  cop 3378  cotp 3379
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-14 1405  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-pow 3927  ax-pr 3944
This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-pw 3361  df-sn 3381  df-pr 3382  df-op 3384  df-ot 3385
This theorem is referenced by:  euotd  3991
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