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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 4352 | . 2 ⊢ ∅ ⊆ 𝐴 | |
| 2 | 0ex 5252 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | elpw 4558 | . 2 ⊢ (∅ ∈ 𝒫 𝐴 ↔ ∅ ⊆ 𝐴) |
| 4 | 1, 3 | mpbir 231 | 1 ⊢ ∅ ∈ 𝒫 𝐴 |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2113 ⊆ wss 3901 ∅c0 4285 𝒫 cpw 4554 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-ext 2708 ax-nul 5251 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-clab 2715 df-cleq 2728 df-clel 2811 df-v 3442 df-dif 3904 df-ss 3918 df-nul 4286 df-pw 4556 |
| This theorem is referenced by: pwne0 5302 marypha1lem 9336 brwdom2 9478 canthwdom 9484 isfin1-3 10296 canthp1lem2 10564 ixxssxr 13273 incexc 15760 smupf 16405 hashbc0 16933 ramz2 16952 mreexexlem3d 17569 acsfn 17582 isdrs2 18229 fpwipodrs 18463 pwmndid 18861 pwmnd 18862 clsval2 22994 mretopd 23036 comppfsc 23476 alexsubALTlem2 23992 alexsubALTlem4 23994 0no 27805 bday0 27807 0lt1s 27808 bday0b 27809 rightge0 27817 madessno 27836 oldssno 27837 newssno 27838 lltr 27858 made0 27859 eupth2lems 30313 esplyfval0 33722 vieta 33736 esum0 34206 esumcst 34220 esumpcvgval 34235 prsiga 34288 pwldsys 34314 ldgenpisyslem1 34320 carsggect 34475 kur14 35410 0hf 36371 bj-tagss 37181 bj-0int 37306 bj-mooreset 37307 bj-ismoored0 37311 topdifinfindis 37551 0totbnd 37974 heiborlem6 38017 istopclsd 42942 ntrkbimka 44279 ntrk0kbimka 44280 clsk1indlem0 44282 ntrclscls00 44307 ntrneicls11 44331 ismnushort 44542 0pwfi 45304 dvnprodlem3 46192 pwsal 46559 salexct 46578 sge0rnn0 46612 sge00 46620 psmeasure 46715 caragen0 46750 0ome 46773 isomenndlem 46774 ovn0 46810 ovnsubadd2lem 46889 smfresal 47032 sprsymrelfvlem 47736 lincval0 48661 lco0 48673 linds0 48711 |
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