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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 5357. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4782 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5272 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5352 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2866 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2149 Vcvv 3463 ∅c0 4294 𝒫 cpw 4567 {csn 4594 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-ext 2741 ax-sep 5261 ax-nul 5271 ax-pow 5337 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1570 df-fal 1580 df-ex 1807 df-sb 2098 df-clab 2748 df-cleq 2761 df-clel 2844 df-v 3465 df-dif 3916 df-ss 3930 df-nul 4295 df-pw 4569 df-sn 4595 |
| This theorem is referenced by: pp0ex 5358 dtruALT 5360 zfpair 5393 tposexg 8235 fsetexb 8860 endisj 9051 pw2eng 9070 dfac4 10105 dfac2b 10113 axcc2lem 10419 axdc2lem 10431 axcclem 10440 axpowndlem3 10583 isstruct2 17208 cat1 18153 plusffval 18703 grpinvfval 19044 grpsubfval 19049 mulgfval 19134 0symgefmndeq 19463 staffval 20921 scaffval 20978 ipffval 21766 refun0 23640 filconn 24008 alexsubALTlem2 24173 nmfval 24713 tcphex 25344 tchnmfval 25355 legval 28818 vieta 33914 locfinref 34175 oms0 34631 bnj105 35057 ssoninhaus 36847 onint1 36848 bj-tagex 37510 bj-1uplex 37531 rrnval 38365 dvnprodlem3 46553 ioorrnopn 46910 ioorrnopnxr 46912 ismeannd 47072 nelsubc3 49733 setc1ohomfval 50155 |
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