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| Mirrors > Home > MPE Home > Th. List > sdomirr | Structured version Visualization version GIF version | ||
| Description: Strict dominance is irreflexive. Theorem 21(i) of [Suppes] p. 97. (Contributed by NM, 4-Jun-1998.) |
| Ref | Expression |
|---|---|
| sdomirr | ⊢ ¬ 𝐴 ≺ 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sdomnen 8974 | . . 3 ⊢ (𝐴 ≺ 𝐴 → ¬ 𝐴 ≈ 𝐴) | |
| 2 | enrefg 8977 | . . 3 ⊢ (𝐴 ∈ V → 𝐴 ≈ 𝐴) | |
| 3 | 1, 2 | nsyl3 139 | . 2 ⊢ (𝐴 ∈ V → ¬ 𝐴 ≺ 𝐴) |
| 4 | relsdom 8946 | . . . 4 ⊢ Rel ≺ | |
| 5 | 4 | brrelex1i 5717 | . . 3 ⊢ (𝐴 ≺ 𝐴 → 𝐴 ∈ V) |
| 6 | 5 | con3i 155 | . 2 ⊢ (¬ 𝐴 ∈ V → ¬ 𝐴 ≺ 𝐴) |
| 7 | 3, 6 | pm2.61i 184 | 1 ⊢ ¬ 𝐴 ≺ 𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∈ wcel 2143 Vcvv 3455 class class class wbr 5109 ≈ cen 8936 ≺ csdm 8938 |
| 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 5257 ax-pow 5336 ax-pr 5404 ax-un 7732 |
| 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-clab 2742 df-cleq 2755 df-clel 2838 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-br 5110 df-opab 5174 df-id 5556 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-en 8940 df-dom 8941 df-sdom 8942 |
| This theorem is referenced by: sdomn2lp 9100 2pwuninel 9116 2pwne 9117 r111 9743 alephval2 10552 alephom 10565 csdfil 24051 |
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