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Theorem ssctOLD 9073
Description: Obsolete version of ssct 9072 as of 7-Dec-2024. (Contributed by Thierry Arnoux, 31-Jan-2017.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
ssctOLD ((𝐴𝐵𝐵 ≼ ω) → 𝐴 ≼ ω)

Proof of Theorem ssctOLD
StepHypRef Expression
1 ctex 8985 . . . 4 (𝐵 ≼ ω → 𝐵 ∈ V)
2 ssdomg 9021 . . . 4 (𝐵 ∈ V → (𝐴𝐵𝐴𝐵))
31, 2syl 17 . . 3 (𝐵 ≼ ω → (𝐴𝐵𝐴𝐵))
43impcom 407 . 2 ((𝐴𝐵𝐵 ≼ ω) → 𝐴𝐵)
5 domtr 9028 . 2 ((𝐴𝐵𝐵 ≼ ω) → 𝐴 ≼ ω)
64, 5sylancom 588 1 ((𝐴𝐵𝐵 ≼ ω) → 𝐴 ≼ ω)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395  wcel 2107  Vcvv 3463  wss 3931   class class class wbr 5123  ωcom 7868  cdom 8964
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-10 2140  ax-11 2156  ax-12 2176  ax-ext 2706  ax-sep 5276  ax-nul 5286  ax-pow 5345  ax-pr 5412  ax-un 7736
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-nf 1783  df-sb 2064  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2726  df-clel 2808  df-nfc 2884  df-ral 3051  df-rex 3060  df-rab 3420  df-v 3465  df-dif 3934  df-un 3936  df-in 3938  df-ss 3948  df-nul 4314  df-if 4506  df-pw 4582  df-sn 4607  df-pr 4609  df-op 4613  df-uni 4888  df-br 5124  df-opab 5186  df-id 5558  df-xp 5671  df-rel 5672  df-cnv 5673  df-co 5674  df-dm 5675  df-rn 5676  df-res 5677  df-ima 5678  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-dom 8968
This theorem is referenced by: (None)
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