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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 4354 | . 2 ⊢ ∅ ⊆ 𝐴 | |
| 2 | 0ex 5254 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | elpw 4560 | . 2 ⊢ (∅ ∈ 𝒫 𝐴 ↔ ∅ ⊆ 𝐴) |
| 4 | 1, 3 | mpbir 231 | 1 ⊢ ∅ ∈ 𝒫 𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 ⊆ wss 3903 ∅c0 4287 𝒫 cpw 4556 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-nul 5253 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-v 3444 df-dif 3906 df-ss 3920 df-nul 4288 df-pw 4558 |
| This theorem is referenced by: pwne0 5304 marypha1lem 9348 brwdom2 9490 canthwdom 9496 isfin1-3 10308 canthp1lem2 10576 ixxssxr 13285 incexc 15772 smupf 16417 hashbc0 16945 ramz2 16964 mreexexlem3d 17581 acsfn 17594 isdrs2 18241 fpwipodrs 18475 pwmndid 18873 pwmnd 18874 clsval2 23006 mretopd 23048 comppfsc 23488 alexsubALTlem2 24004 alexsubALTlem4 24006 0no 27817 bday0 27819 0lt1s 27820 bday0b 27821 rightge0 27829 madessno 27848 oldssno 27849 newssno 27850 lltr 27870 made0 27871 eupth2lems 30325 esplyfval0 33740 vieta 33756 esum0 34226 esumcst 34240 esumpcvgval 34255 prsiga 34308 pwldsys 34334 ldgenpisyslem1 34340 carsggect 34495 kur14 35429 0hf 36390 bj-tagss 37222 bj-0int 37348 bj-mooreset 37349 bj-ismoored0 37353 topdifinfindis 37595 0totbnd 38018 heiborlem6 38061 istopclsd 43051 ntrkbimka 44388 ntrk0kbimka 44389 clsk1indlem0 44391 ntrclscls00 44416 ntrneicls11 44440 ismnushort 44651 0pwfi 45413 dvnprodlem3 46300 pwsal 46667 salexct 46686 sge0rnn0 46720 sge00 46728 psmeasure 46823 caragen0 46858 0ome 46881 isomenndlem 46882 ovn0 46918 ovnsubadd2lem 46997 smfresal 47140 sprsymrelfvlem 47844 lincval0 48769 lco0 48781 linds0 48819 |
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