| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 5319, ax-un 7713. (Revised by BTernaryTau, 29-Nov-2024.) |
| Ref | Expression |
|---|---|
| sdom0 | ⊢ ¬ 𝐴 ≺ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dom0 9071 | . . . 4 ⊢ (𝐴 ≼ ∅ ↔ 𝐴 = ∅) | |
| 2 | en0 8993 | . . . 4 ⊢ (𝐴 ≈ ∅ ↔ 𝐴 = ∅) | |
| 3 | 1, 2 | sylbb2 240 | . . 3 ⊢ (𝐴 ≼ ∅ → 𝐴 ≈ ∅) |
| 4 | iman 405 | . . 3 ⊢ ((𝐴 ≼ ∅ → 𝐴 ≈ ∅) ↔ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)) | |
| 5 | 3, 4 | mpbi 232 | . 2 ⊢ ¬ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅) |
| 6 | brsdom 8949 | . 2 ⊢ (𝐴 ≺ ∅ ↔ (𝐴 ≼ ∅ ∧ ¬ 𝐴 ≈ ∅)) | |
| 7 | 5, 6 | mtbir 325 | 1 ⊢ ¬ 𝐴 ≺ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ∧ wa 399 = wceq 1559 ∅c0 4283 class class class wbr 5097 ≈ cen 8918 ≼ cdom 8919 ≺ csdm 8920 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-ext 2733 ax-sep 5243 ax-nul 5253 ax-pr 5387 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-sb 2090 df-mo 2565 df-clab 2740 df-cleq 2753 df-clel 2836 df-ral 3076 df-rex 3086 df-rab 3414 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4284 df-if 4478 df-sn 4580 df-pr 4582 df-op 4586 df-br 5098 df-opab 5160 df-id 5538 df-xp 5649 df-rel 5650 df-cnv 5651 df-co 5652 df-dm 5653 df-rn 5654 df-fun 6518 df-fn 6519 df-f 6520 df-f1 6521 df-fo 6522 df-f1o 6523 df-en 8922 df-dom 8923 df-sdom 8924 |
| This theorem is referenced by: domunsn 9093 sdomsdomcardi 9923 canthp1lem1 10604 canthp1lem2 10605 rankcf 10729 |
| Copyright terms: Public domain | W3C validator |