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| Mirrors > Home > MPE Home > Th. List > sdomnsym | Structured version Visualization version GIF version | ||
| Description: Strict dominance is asymmetric. Theorem 21(ii) of [Suppes] p. 97. (Contributed by NM, 8-Jun-1998.) |
| Ref | Expression |
|---|---|
| sdomnsym | ⊢ (𝐴 ≺ 𝐵 → ¬ 𝐵 ≺ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sdomnen 8916 | . 2 ⊢ (𝐴 ≺ 𝐵 → ¬ 𝐴 ≈ 𝐵) | |
| 2 | sdomdom 8915 | . . 3 ⊢ (𝐴 ≺ 𝐵 → 𝐴 ≼ 𝐵) | |
| 3 | sdomdom 8915 | . . 3 ⊢ (𝐵 ≺ 𝐴 → 𝐵 ≼ 𝐴) | |
| 4 | sbth 9023 | . . 3 ⊢ ((𝐴 ≼ 𝐵 ∧ 𝐵 ≼ 𝐴) → 𝐴 ≈ 𝐵) | |
| 5 | 2, 3, 4 | syl2an 596 | . 2 ⊢ ((𝐴 ≺ 𝐵 ∧ 𝐵 ≺ 𝐴) → 𝐴 ≈ 𝐵) |
| 6 | 1, 5 | mtand 815 | 1 ⊢ (𝐴 ≺ 𝐵 → ¬ 𝐵 ≺ 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 class class class wbr 5096 ≈ cen 8878 ≼ cdom 8879 ≺ csdm 8880 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-12 2182 ax-ext 2706 ax-sep 5239 ax-nul 5249 ax-pow 5308 ax-pr 5375 ax-un 7678 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-mo 2537 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2809 df-ral 3050 df-rex 3059 df-rab 3398 df-v 3440 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4579 df-pr 4581 df-op 4585 df-uni 4862 df-br 5097 df-opab 5159 df-id 5517 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-en 8882 df-dom 8883 df-sdom 8884 |
| This theorem is referenced by: domnsym 9029 gchpwdom 10579 |
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