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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 5371, ax-un 7754. (Revised by BTernaryTau, 29-Nov-2024.) |
Ref | Expression |
---|---|
sdom0 | ⊢ ¬ 𝐴 ≺ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dom0 9141 | . . . 4 ⊢ (𝐴 ≼ ∅ ↔ 𝐴 = ∅) | |
2 | en0 9057 | . . . 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 9014 | . 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 1537 ∅c0 4339 class class class wbr 5148 ≈ cen 8981 ≼ cdom 8982 ≺ csdm 8983 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-sep 5302 ax-nul 5312 ax-pr 5438 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-ral 3060 df-rex 3069 df-rab 3434 df-v 3480 df-dif 3966 df-un 3968 df-ss 3980 df-nul 4340 df-if 4532 df-sn 4632 df-pr 4634 df-op 4638 df-br 5149 df-opab 5211 df-id 5583 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-en 8985 df-dom 8986 df-sdom 8987 |
This theorem is referenced by: domunsn 9166 sdomsdomcardi 10009 canthp1lem1 10690 canthp1lem2 10691 rankcf 10815 |
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