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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 5350. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4773 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5264 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5345 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2857 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 Vcvv 3450 ∅c0 4279 𝒫 cpw 4557 {csn 4584 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-v 3452 df-dif 3902 df-ss 3916 df-nul 4280 df-pw 4559 df-sn 4585 |
| This theorem is used by: pp0ex 5351 dtruALT 5353 zfpair 5386 tposexg 8239 fsetexb 8866 endisj 9063 pw2eng 9082 dfac4 10126 dfac2b 10134 axcc2lem 10439 axdc2lem 10451 axcclem 10460 axpowndlem3 10609 isstruct2 17242 cat1 18187 plusffval 18737 grpinvfval 19103 grpsubfval 19108 mulgfval 19193 0symgefmndeq 19522 staffval 21008 scaffval 21065 ipffval 21862 refun0 23742 filconn 24110 alexsubALTlem2 24275 nmfval 24815 tcphex 25446 tchnmfval 25457 legval 28927 vieta 34091 locfinref 34352 oms0 34809 bnj105 35235 ssoninhaus 37068 onint1 37069 bj-tagex 37732 bj-1uplex 37753 rrnval 38578 dvnprodlem3 46777 ioorrnopn 47134 ioorrnopnxr 47136 ismeannd 47296 nelsubc3 49998 setc1ohomfval 50420 |
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