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| Mirrors > Home > MPE Home > Th. List > sdom0 | Structured version Visualization version GIF version | ||
| Description: The empty set does not strictly dominate any set. (Contributed by NM, 26-Oct-2003.) Avoid ax-pow 5312, ax-un 7690. (Revised by BTernaryTau, 29-Nov-2024.) |
| Ref | Expression |
|---|---|
| sdom0 | ⊢ ¬ 𝐴 ≺ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dom0 9045 | . . . 4 ⊢ (𝐴 ≼ ∅ ↔ 𝐴 = ∅) | |
| 2 | en0 8967 | . . . 4 ⊢ (𝐴 ≈ ∅ ↔ 𝐴 = ∅) | |
| 3 | 1, 2 | sylbb2 238 | . . 3 ⊢ (𝐴 ≼ ∅ → 𝐴 ≈ ∅) |
| 4 | iman 401 | . . 3 ⊢ ((𝐴 ≼ ∅ → 𝐴 ≈ ∅) ↔ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)) | |
| 5 | 3, 4 | mpbi 230 | . 2 ⊢ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅) |
| 6 | brsdom 8923 | . 2 ⊢ (𝐴 ≺ ∅ ↔ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)) | |
| 7 | 5, 6 | mtbir 323 | 1 ⊢ ¬ 𝐴 ≺ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 = wceq 1542 ∅c0 4287 class class class wbr 5100 ≈ cen 8892 ≼ cdom 8893 ≺ csdm 8894 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pr 5379 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-mo 2540 df-clab 2716 df-cleq 2729 df-clel 2812 df-ral 3053 df-rex 3063 df-rab 3402 df-v 3444 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-nul 4288 df-if 4482 df-sn 4583 df-pr 4585 df-op 4589 df-br 5101 df-opab 5163 df-id 5527 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-en 8896 df-dom 8897 df-sdom 8898 |
| This theorem is referenced by: domunsn 9067 sdomsdomcardi 9895 canthp1lem1 10575 canthp1lem2 10576 rankcf 10700 |
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