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Mirrors > Home > MPE Home > Th. List > 0elpw | Structured version Visualization version GIF version |
Description: Every power class contains the empty set. (Contributed by NM, 25-Oct-2007.) |
Ref | Expression |
---|---|
0elpw | ⊢ ∅ ∈ 𝒫 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0ss 3924 | . 2 ⊢ ∅ ⊆ 𝐴 | |
2 | 0ex 4718 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | elpw 4114 | . 2 ⊢ (∅ ∈ 𝒫 𝐴 ↔ ∅ ⊆ 𝐴) |
4 | 1, 3 | mpbir 220 | 1 ⊢ ∅ ∈ 𝒫 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 1977 ⊆ wss 3540 ∅c0 3874 𝒫 cpw 4108 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-nul 4717 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-v 3175 df-dif 3543 df-in 3547 df-ss 3554 df-nul 3875 df-pw 4110 |
This theorem is referenced by: pwne0 4761 marypha1lem 8222 brwdom2 8361 canthwdom 8367 pwcdadom 8921 isfin1-3 9091 canthp1lem2 9354 ixxssxr 12058 incexc 14408 smupf 15038 hashbc0 15547 ramz2 15566 mreexexlem3d 16129 acsfn 16143 isdrs2 16762 fpwipodrs 16987 clsval2 20664 mretopd 20706 comppfsc 21145 alexsubALTlem2 21662 alexsubALTlem4 21664 eupath2 26507 esum0 29438 esumcst 29452 esumpcvgval 29467 prsiga 29521 pwldsys 29547 ldgenpisyslem1 29553 carsggect 29707 kur14 30452 0hf 31454 bj-tagss 32161 topdifinfindis 32370 0totbnd 32742 heiborlem6 32785 istopclsd 36281 ntrkbimka 37356 ntrk0kbimka 37357 clsk1indlem0 37359 ntrclscls00 37384 ntrneicls11 37408 0pwfi 38252 dvnprodlem3 38838 pwsal 39211 salexct 39228 sge0rnn0 39261 sge00 39269 psmeasure 39364 caragen0 39396 0ome 39419 isomenndlem 39420 ovn0 39456 ovnsubadd2lem 39535 smfresal 39673 eupth2lems 41406 lincval0 41998 lco0 42010 linds0 42048 |
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