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| Mirrors > Home > MPE Home > Th. List > domnsym | Structured version Visualization version GIF version | ||
| Description: Theorem 22(i) of [Suppes] p. 97. (Contributed by NM, 10-Jun-1998.) |
| Ref | Expression |
|---|---|
| domnsym | ⊢ (𝐴 ≼ 𝐵 → ¬ 𝐵 ≺ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | brdom2 8988 | . 2 ⊢ (𝐴 ≼ 𝐵 ↔ (𝐴 ≺ 𝐵 ∨ 𝐴 ≈ 𝐵)) | |
| 2 | sdomnsym 9100 | . . 3 ⊢ (𝐴 ≺ 𝐵 → ¬ 𝐵 ≺ 𝐴) | |
| 3 | sdomnen 8987 | . . . 4 ⊢ (𝐵 ≺ 𝐴 → ¬ 𝐵 ≈ 𝐴) | |
| 4 | ensym 9009 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) | |
| 5 | 3, 4 | nsyl3 139 | . . 3 ⊢ (𝐴 ≈ 𝐵 → ¬ 𝐵 ≺ 𝐴) |
| 6 | 2, 5 | jaoi 871 | . 2 ⊢ ((𝐴 ≺ 𝐵 ∨ 𝐴 ≈ 𝐵) → ¬ 𝐵 ≺ 𝐴) |
| 7 | 1, 6 | sylbi 220 | 1 ⊢ (𝐴 ≼ 𝐵 → ¬ 𝐵 ≺ 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∨ wo 861 class class class wbr 5103 ≈ cen 8949 ≼ cdom 8950 ≺ 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-10 2178 ax-11 2194 ax-12 2213 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-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 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-er 8696 df-en 8953 df-dom 8954 df-sdom 8955 |
| This theorem is used by: sdomdomtr 9108 domsdomtr 9110 sdomdif 9123 onsdominel 9124 fofinf1o 9299 carddom2 9982 fidomtri 9998 fidomtri2 9999 infxpenlem 10016 alephordi 10077 infdif 10210 infdif2 10211 cfslbn 10269 cfslb2n 10270 fincssdom 10325 fin45 10394 domtriom 10445 alephval2 10581 alephreg 10591 pwcfsdom 10592 cfpwsdom 10593 pwfseqlem3 10669 gchpwdom 10679 gchaleph 10680 hargch 10682 gchhar 10688 winainflem 10702 rankcf 10786 tskcard 10790 vdwlem12 17084 odinf 19690 rectbntr0 25059 erdszelem10 35779 finminlem 36937 fimgmcyc 43416 fphpd 43657 |
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