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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 8918 | . . 3 ⊢ (𝐴 ≺ 𝐴 → ¬ 𝐴 ≈ 𝐴) | |
| 2 | enrefg 8921 | . . 3 ⊢ (𝐴 ∈ V → 𝐴 ≈ 𝐴) | |
| 3 | 1, 2 | nsyl3 138 | . 2 ⊢ (𝐴 ∈ V → ¬ 𝐴 ≺ 𝐴) |
| 4 | relsdom 8890 | . . . 4 ⊢ Rel ≺ | |
| 5 | 4 | brrelex1i 5674 | . . 3 ⊢ (𝐴 ≺ 𝐴 → 𝐴 ∈ V) |
| 6 | 5 | con3i 154 | . 2 ⊢ (¬ 𝐴 ∈ V → ¬ 𝐴 ≺ 𝐴) |
| 7 | 3, 6 | pm2.61i 183 | 1 ⊢ ¬ 𝐴 ≺ 𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 ∈ wcel 2119 Vcvv 3431 class class class wbr 5072 ≈ cen 8880 ≺ csdm 8882 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 ax-sep 5218 ax-pow 5294 ax-pr 5362 ax-un 7678 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-clel 2814 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-pw 4531 df-sn 4556 df-pr 4558 df-op 4562 df-uni 4839 df-br 5073 df-opab 5135 df-id 5513 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-rn 5629 df-res 5630 df-ima 5631 df-fun 6487 df-fn 6488 df-f 6489 df-f1 6490 df-fo 6491 df-f1o 6492 df-en 8884 df-dom 8885 df-sdom 8886 |
| This theorem is referenced by: sdomn2lp 9044 2pwuninel 9060 2pwne 9061 r111 9690 alephval2 10486 alephom 10499 csdfil 23877 |
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