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Theorem sdom0 9098
Description: The empty set does not strictly dominate any set. (Contributed by NM, 26-Oct-2003.) Avoid ax-pow 5338, ax-un 7734. (Revised by BTernaryTau, 29-Nov-2024.)
Assertion
Ref Expression
sdom0 ¬ 𝐴 ≺ ∅

Proof of Theorem sdom0
StepHypRef Expression
1 dom0 9094 . . . 4 (𝐴 ≼ ∅ ↔ 𝐴 = ∅)
2 en0 9016 . . . 4 (𝐴 ≈ ∅ ↔ 𝐴 = ∅)
31, 2sylbb2 241 . . 3 (𝐴 ≼ ∅ → 𝐴 ≈ ∅)
4 iman 406 . . 3 ((𝐴 ≼ ∅ → 𝐴 ≈ ∅) ↔ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅))
53, 4mpbi 233 . 2 ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)
6 brsdom 8972 . 2 (𝐴 ≺ ∅ ↔ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅))
75, 6mtbir 326 1 ¬ 𝐴 ≺ ∅
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 400   = wceq 1570  c0 4287   class class class wbr 5110  cen 8941  cdom 8942  csdm 8943
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5258  ax-nul 5270  ax-pr 5406
This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-mo 2567  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4288  df-if 4489  df-sn 4591  df-pr 4593  df-op 4597  df-br 5111  df-opab 5175  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-fun 6540  df-fn 6541  df-f 6542  df-f1 6543  df-fo 6544  df-f1o 6545  df-en 8945  df-dom 8946  df-sdom 8947
This theorem is referenced by:  domunsn  9116  sdomsdomcardi  9958  canthp1lem1  10638  canthp1lem2  10639  rankcf  10763
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