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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 5334, ax-un 7730. (Revised by BTernaryTau, 29-Nov-2024.) |
| Ref | Expression |
|---|---|
| sdom0 | ⊢ ¬ 𝐴 ≺ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dom0 9089 | . . . 4 ⊢ (𝐴 ≼ ∅ ↔ 𝐴 = ∅) | |
| 2 | en0 9011 | . . . 4 ⊢ (𝐴 ≈ ∅ ↔ 𝐴 = ∅) | |
| 3 | 1, 2 | sylbb2 241 | . . 3 ⊢ (𝐴 ≼ ∅ → 𝐴 ≈ ∅) |
| 4 | iman 406 | . . 3 ⊢ ((𝐴 ≼ ∅ → 𝐴 ≈ ∅) ↔ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)) | |
| 5 | 3, 4 | mpbi 233 | . 2 ⊢ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅) |
| 6 | brsdom 8967 | . 2 ⊢ (𝐴 ≺ ∅ ↔ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)) | |
| 7 | 5, 6 | mtbir 326 | 1 ⊢ ¬ 𝐴 ≺ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 400 = wceq 1567 ∅c0 4294 class class class wbr 5110 ≈ cen 8936 ≼ cdom 8937 ≺ csdm 8938 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 ax-sep 5258 ax-nul 5268 ax-pr 5402 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-mo 2573 df-clab 2748 df-cleq 2761 df-clel 2844 df-ral 3086 df-rex 3096 df-rab 3424 df-v 3465 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-nul 4295 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-br 5111 df-opab 5175 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-en 8940 df-dom 8941 df-sdom 8942 |
| This theorem is referenced by: domunsn 9111 sdomsdomcardi 9953 canthp1lem1 10633 canthp1lem2 10634 rankcf 10758 |
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