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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 9002 | . 2 ⊢ (𝐴 ≼ 𝐵 ↔ (𝐴 ≺ 𝐵 ∨ 𝐴 ≈ 𝐵)) | |
| 2 | sdomnsym 9114 | . . 3 ⊢ (𝐴 ≺ 𝐵 → ¬ 𝐵 ≺ 𝐴) | |
| 3 | sdomnen 9001 | . . . 4 ⊢ (𝐵 ≺ 𝐴 → ¬ 𝐵 ≈ 𝐴) | |
| 4 | ensym 9023 | . . . 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 8963 ≼ cdom 8964 ≺ csdm 8965 |
| 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 2733 ax-sep 5249 ax-pow 5327 ax-pr 5391 ax-un 7749 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 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 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-er 8710 df-en 8967 df-dom 8968 df-sdom 8969 |
| This theorem is used by: sdomdomtr 9122 domsdomtr 9124 sdomdif 9137 onsdominel 9138 fofinf1o 9314 carddom2 10051 fidomtri 10067 fidomtri2 10068 infxpenlem 10085 alephordi 10146 infdif 10279 infdif2 10280 cfslbn 10338 cfslb2n 10339 fincssdom 10394 fin45 10463 domtriom 10514 alephval2 10650 alephreg 10660 pwcfsdom 10661 cfpwsdom 10662 pwfseqlem3 10738 gchpwdom 10748 gchaleph 10749 hargch 10751 gchhar 10757 winainflem 10771 rankcf 10855 tskcard 10859 vdwlem12 17163 odinf 19770 rectbntr0 25145 erdszelem10 35944 finminlem 37086 fimgmcyc 43578 fphpd 43802 |
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