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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 5323. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4756 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5243 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5318 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2834 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 Vcvv 3430 ∅c0 4274 𝒫 cpw 4542 {csn 4568 |
| 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 5232 ax-nul 5242 ax-pow 5303 |
| 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 3432 df-dif 3893 df-ss 3907 df-nul 4275 df-pw 4544 df-sn 4569 |
| This theorem is referenced by: pp0ex 5324 dtruALT 5326 zfpair 5359 tposexg 8184 fsetexb 8805 endisj 8996 pw2eng 9015 dfac4 10038 dfac2b 10047 axcc2lem 10352 axdc2lem 10364 axcclem 10373 axpowndlem3 10516 isstruct2 17113 cat1 18058 plusffval 18608 grpinvfval 18948 grpsubfval 18953 mulgfval 19039 0symgefmndeq 19363 staffval 20812 scaffval 20869 ipffval 21641 refun0 23493 filconn 23861 alexsubALTlem2 24026 nmfval 24566 tcphex 25197 tchnmfval 25208 legval 28669 vieta 33742 locfinref 34004 oms0 34460 bnj105 34886 ssoninhaus 36649 onint1 36650 bj-tagex 37313 bj-1uplex 37334 rrnval 38165 dvnprodlem3 46397 ioorrnopn 46754 ioorrnopnxr 46756 ismeannd 46916 nelsubc3 49561 setc1ohomfval 49983 |
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