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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 5330. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4768 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5252 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5325 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2833 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2113 Vcvv 3440 ∅c0 4285 𝒫 cpw 4554 {csn 4580 |
| 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-sep 5241 ax-nul 5251 ax-pow 5310 |
| 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 df-sn 4581 |
| This theorem is referenced by: pp0ex 5331 dtruALT 5333 zfpair 5366 tposexg 8182 fsetexb 8801 endisj 8992 pw2eng 9011 dfac4 10032 dfac2b 10041 axcc2lem 10346 axdc2lem 10358 axcclem 10367 axpowndlem3 10510 isstruct2 17076 cat1 18021 plusffval 18571 grpinvfval 18908 grpsubfval 18913 mulgfval 18999 0symgefmndeq 19323 staffval 20774 scaffval 20831 lpival 21279 ipffval 21603 refun0 23459 filconn 23827 alexsubALTlem2 23992 nmfval 24532 tcphex 25173 tchnmfval 25184 legval 28656 vieta 33736 locfinref 33998 oms0 34454 bnj105 34880 ssoninhaus 36642 onint1 36643 bj-tagex 37188 bj-1uplex 37209 rrnval 38028 lsatset 39250 mnuprdlem2 44514 mnuprdlem3 44515 dvnprodlem3 46192 ioorrnopn 46549 ioorrnopnxr 46551 ismeannd 46711 nelsubc3 49316 setc1ohomfval 49738 |
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