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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 5330, ax-un 7736. (Revised by BTernaryTau, 29-Nov-2024.) |
| Ref | Expression |
|---|---|
| sdom0 | ⊢ ¬ 𝐴 ≺ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dom0 9103 | . . . 4 ⊢ (𝐴 ≼ ∅ ↔ 𝐴 = ∅) | |
| 2 | en0 9024 | . . . 4 ⊢ (𝐴 ≈ ∅ ↔ 𝐴 = ∅) | |
| 3 | 1, 2 | sylbb2 241 | . . 3 ⊢ (𝐴 ≼ ∅ → 𝐴 ≈ ∅) |
| 4 | iman 407 | . . 3 ⊢ ((𝐴 ≼ ∅ → 𝐴 ≈ ∅) ↔ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)) | |
| 5 | 3, 4 | mpbi 233 | . 2 ⊢ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅) |
| 6 | brsdom 8980 | . 2 ⊢ (𝐴 ≺ ∅ ↔ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)) | |
| 7 | 5, 6 | mtbir 326 | 1 ⊢ ¬ 𝐴 ≺ ∅ |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 → wi 4 ∧ wa 401 = wceq 1570 ∅c0 4279 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-ext 2732 ax-sep 5251 ax-nul 5263 ax-pr 5398 |
| 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-sb 2100 df-mo 2564 df-clab 2739 df-cleq 2752 df-clel 2835 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-sn 4585 df-pr 4587 df-op 4591 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-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-en 8953 df-dom 8954 df-sdom 8955 |
| This theorem is used by: domunsn 9125 sdomsdomcardi 9976 canthp1lem1 10661 canthp1lem2 10662 rankcf 10786 |
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