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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 5338, ax-un 7734. (Revised by BTernaryTau, 29-Nov-2024.) |
| Ref | Expression |
|---|---|
| 0sdomg | ⊢ (𝐴 ∈ 𝑉 → (∅ ≺ 𝐴 ↔ 𝐴 ≠ ∅)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0domg 9093 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ∅ ≼ 𝐴) | |
| 2 | brsdom 8972 | . . . 4 ⊢ (∅ ≺ 𝐴 ↔ (∅ ≼ 𝐴 ∧ ¬ ∅ ≈ 𝐴)) | |
| 3 | 2 | baib 544 | . . 3 ⊢ (∅ ≼ 𝐴 → (∅ ≺ 𝐴 ↔ ¬ ∅ ≈ 𝐴)) |
| 4 | 1, 3 | syl 18 | . 2 ⊢ (𝐴 ∈ 𝑉 → (∅ ≺ 𝐴 ↔ ¬ ∅ ≈ 𝐴)) |
| 5 | en0r 9018 | . . 3 ⊢ (∅ ≈ 𝐴 ↔ 𝐴 = ∅) | |
| 6 | 5 | necon3bbii 3005 | . 2 ⊢ (¬ ∅ ≈ 𝐴 ↔ 𝐴 ≠ ∅) |
| 7 | 4, 6 | bitrdi 290 | 1 ⊢ (𝐴 ∈ 𝑉 → (∅ ≺ 𝐴 ↔ 𝐴 ≠ ∅)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∈ wcel 2143 ≠ wne 2958 ∅c0 4287 class class class wbr 5110 ≈ cen 8941 ≼ cdom 8942 ≺ csdm 8943 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5258 ax-nul 5270 ax-pr 5406 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-mo 2567 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3417 df-v 3457 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4489 df-sn 4591 df-pr 4593 df-op 4597 df-br 5111 df-opab 5175 df-id 5558 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-en 8945 df-dom 8946 df-sdom 8947 |
| This theorem is referenced by: 0sdom 9097 fodomr 9117 pwdom 9118 0sdom1dom 9207 1sdom2dom 9215 infn0ALT 9264 fodomfir 9288 fodomfib 9289 domwdom 9537 iunfictbso 10099 djulepw 10177 fin45 10377 fodomb 10511 brdom3 10513 gchxpidm 10655 inar1 10761 csdfil 24032 ovoliunnul 25647 carsgclctunlem3 34688 domalom 38028 ovoliunnfl 38291 voliunnfl 38293 volsupnfl 38294 sdomne0 44119 sdomne0d 44120 ensucne0OLD 44236 nnfoctb 45748 caragenunicl 47218 |
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