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Theorem sdomirr 9112
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 8987 . . 3 (𝐴𝐴 → ¬ 𝐴𝐴)
2 enrefg 8990 . . 3 (𝐴 ∈ V → 𝐴𝐴)
31, 2nsyl3 139 . 2 (𝐴 ∈ V → ¬ 𝐴𝐴)
4 relsdom 8959 . . . 4 Rel ≺
54brrelex1i 5711 . . 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 2145  Vcvv 3450   class class class wbr 5103  cen 8949  csdm 8951
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 2147  ax-9 2155  ax-ext 2732  ax-sep 5251  ax-pow 5330  ax-pr 5398  ax-un 7736
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 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-pw 4559  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668  df-fun 6535  df-fn 6536  df-f 6537  df-f1 6538  df-fo 6539  df-f1o 6540  df-en 8953  df-dom 8954  df-sdom 8955
This theorem is used by:  sdomn2lp  9114  2pwuninel  9130  2pwne  9131  r111  9757  alephval2  10581  alephom  10594  csdfil  24120
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