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Theorem sdomirr 9171
Description: Strict dominance is irreflexive. Theorem 21(i) of [Suppes] p. 97. (Contributed by NM, 4-Jun-1998.)
Assertion
Ref Expression
sdomirr ¬ 𝐴 ≺ 𝐴

Proof of Theorem sdomirr
StepHypRef Expression
1 sdomnen 9046 . . 3 (𝐴 ≺ 𝐴 → ¬ 𝐴 ≈ 𝐴)
2 enrefg 9049 . . 3 (𝐴 ∈ V → 𝐴 ≈ 𝐴)
31, 2nsyl3 139 . 2 (𝐴 ∈ V → ¬ 𝐴 ≺ 𝐴)
4 relsdom 9018 . . . 4 Rel ≺
54brrelex1i 5714 . . 3 (𝐴 ≺ 𝐴 → 𝐴 ∈ V)
65con3i 155 . 2 (¬ 𝐴 ∈ V → ¬ 𝐴 ≺ 𝐴)
73, 6pm2.61i 184 1 ¬ 𝐴 ≺ 𝐴
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   ∈ wcel 2147  Vcvv 3454   class class class wbr 5108   ≈ cen 9008   ≺ csdm 9010
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-sep 5255  ax-pow 5334  ax-pr 5398  ax-un 7783
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 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4841  df-uni 4873  df-br 5109  df-opab 5174  df-id 5553  df-xp 5664  df-rel 5665  df-cnv 5666  df-co 5667  df-dm 5668  df-rn 5669  df-res 5670  df-ima 5671  df-fun 6568  df-fn 6569  df-f 6570  df-f1 6571  df-fo 6572  df-f1o 6573  df-en 9012  df-dom 9013  df-sdom 9014
This theorem is used by:  sdomn2lp  9173  2pwuninel  9189  2pwne  9190  r111  9819  alephval2  10696  alephom  10709  csdfil  24268
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