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Theorem sdomirr 9109
Description: Strict dominance is irreflexive. Theorem 21(i) of [Suppes] p. 97. (Contributed by NM, 4-Jun-1998.)
Assertion
Ref Expression
sdomirr ¬ 𝐴𝐴

Proof of Theorem sdomirr
StepHypRef Expression
1 sdomnen 8984 . . 3 (𝐴𝐴 → ¬ 𝐴𝐴)
2 enrefg 8987 . . 3 (𝐴 ∈ V → 𝐴𝐴)
31, 2nsyl3 139 . 2 (𝐴 ∈ V → ¬ 𝐴𝐴)
4 relsdom 8956 . . . 4 Rel ≺
54brrelex1i 5719 . . 3 (𝐴𝐴𝐴 ∈ V)
65con3i 155 . 2 𝐴 ∈ V → ¬ 𝐴𝐴)
73, 6pm2.61i 184 1 ¬ 𝐴𝐴
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3  wcel 2146  Vcvv 3457   class class class wbr 5111  cen 8946  csdm 8948
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-ext 2737  ax-sep 5259  ax-pow 5338  ax-pr 5406  ax-un 7742
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2744  df-cleq 2757  df-clel 2840  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4875  df-br 5112  df-opab 5176  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-ima 5676  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-en 8950  df-dom 8951  df-sdom 8952
This theorem is used by:  sdomn2lp  9111  2pwuninel  9127  2pwne  9128  r111  9754  alephval2  10572  alephom  10585  csdfil  24102
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