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| Mirrors > Home > MPE Home > Th. List > p0ex | Structured version Visualization version GIF version | ||
| Description: The power set of the empty set (the ordinal 1) is a set. See also p0exALT 5332. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4770 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5254 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5327 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2834 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 Vcvv 3442 ∅c0 4287 𝒫 cpw 4556 {csn 4582 |
| 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-sep 5243 ax-nul 5253 ax-pow 5312 |
| 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 df-sn 4583 |
| This theorem is referenced by: pp0ex 5333 dtruALT 5335 zfpair 5368 tposexg 8192 fsetexb 8813 endisj 9004 pw2eng 9023 dfac4 10044 dfac2b 10053 axcc2lem 10358 axdc2lem 10370 axcclem 10379 axpowndlem3 10522 isstruct2 17088 cat1 18033 plusffval 18583 grpinvfval 18920 grpsubfval 18925 mulgfval 19011 0symgefmndeq 19335 staffval 20786 scaffval 20843 lpival 21291 ipffval 21615 refun0 23471 filconn 23839 alexsubALTlem2 24004 nmfval 24544 tcphex 25185 tchnmfval 25196 legval 28668 vieta 33757 locfinref 34019 oms0 34475 bnj105 34901 ssoninhaus 36664 onint1 36665 bj-tagex 37235 bj-1uplex 37256 rrnval 38078 lsatset 39366 mnuprdlem2 44629 mnuprdlem3 44630 dvnprodlem3 46306 ioorrnopn 46663 ioorrnopnxr 46665 ismeannd 46825 nelsubc3 49430 setc1ohomfval 49852 |
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