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| Mirrors > Home > MPE Home > Th. List > 0sdomg | Structured version Visualization version GIF version | ||
| Description: A set strictly dominates the empty set iff it is not empty. (Contributed by NM, 23-Mar-2006.) Avoid ax-pow 5320, ax-un 7711. (Revised by BTernaryTau, 29-Nov-2024.) |
| Ref | Expression |
|---|---|
| 0sdomg | ⊢ (𝐴 ∈ 𝑉 → (∅ ≺ 𝐴 ↔ 𝐴 ≠ ∅)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0domg 9068 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ∅ ≼ 𝐴) | |
| 2 | brsdom 8946 | . . . 4 ⊢ (∅ ≺ 𝐴 ↔ (∅ ≼ 𝐴 ∧ ¬ ∅ ≈ 𝐴)) | |
| 3 | 2 | baib 535 | . . 3 ⊢ (∅ ≼ 𝐴 → (∅ ≺ 𝐴 ↔ ¬ ∅ ≈ 𝐴)) |
| 4 | 1, 3 | syl 17 | . 2 ⊢ (𝐴 ∈ 𝑉 → (∅ ≺ 𝐴 ↔ ¬ ∅ ≈ 𝐴)) |
| 5 | en0r 8991 | . . 3 ⊢ (∅ ≈ 𝐴 ↔ 𝐴 = ∅) | |
| 6 | 5 | necon3bbii 2972 | . 2 ⊢ (¬ ∅ ≈ 𝐴 ↔ 𝐴 ≠ ∅) |
| 7 | 4, 6 | bitrdi 287 | 1 ⊢ (𝐴 ∈ 𝑉 → (∅ ≺ 𝐴 ↔ 𝐴 ≠ ∅)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∈ wcel 2109 ≠ wne 2925 ∅c0 4296 class class class wbr 5107 ≈ cen 8915 ≼ cdom 8916 ≺ csdm 8917 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5251 ax-nul 5261 ax-pr 5387 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-clab 2708 df-cleq 2721 df-clel 2803 df-ne 2926 df-ral 3045 df-rex 3054 df-rab 3406 df-v 3449 df-dif 3917 df-un 3919 df-ss 3931 df-nul 4297 df-if 4489 df-sn 4590 df-pr 4592 df-op 4596 df-br 5108 df-opab 5170 df-id 5533 df-xp 5644 df-rel 5645 df-cnv 5646 df-co 5647 df-dm 5648 df-rn 5649 df-fun 6513 df-fn 6514 df-f 6515 df-f1 6516 df-fo 6517 df-f1o 6518 df-en 8919 df-dom 8920 df-sdom 8921 |
| This theorem is referenced by: 0sdom 9072 fodomr 9092 pwdom 9093 0sdom1dom 9185 sdom1OLD 9190 1sdom2dom 9194 infn0ALT 9252 fodomfir 9279 fodomfib 9280 fodomfibOLD 9282 domwdom 9527 iunfictbso 10067 djulepw 10146 fin45 10345 fodomb 10479 brdom3 10481 gchxpidm 10622 inar1 10728 csdfil 23781 ovoliunnul 25408 carsgclctunlem3 34311 domalom 37392 ovoliunnfl 37656 voliunnfl 37658 volsupnfl 37659 sdomne0 43402 sdomne0d 43403 ensucne0OLD 43519 nnfoctb 45042 caragenunicl 46522 |
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