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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 5354. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4835 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5267 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5349 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2861 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2147 Vcvv 3454 ∅c0 4281 𝒫 cpw 4560 {csn 4588 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 ax-sep 5255 ax-nul 5266 ax-pow 5334 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-v 3456 df-ss 3901 df-dif 4050 df-nul 4282 df-pw 4562 df-sn 4589 |
| This theorem is used by: pp0ex 5355 dtruALT 5357 zfpair 5390 tposexg 8295 fsetexb 8924 endisj 9121 pw2eng 9140 dfac4 10240 dfac2b 10248 axcc2lem 10553 axdc2lem 10565 axcclem 10574 axpowndlem3 10723 isstruct2 17371 cat1 18322 plusffval 18872 grpinvfval 19239 grpsubfval 19244 mulgfval 19329 0symgefmndeq 19659 staffval 21149 scaffval 21206 ipffval 22009 refun0 23889 filconn 24257 alexsubALTlem2 24422 nmfval 24962 tcphex 25593 tchnmfval 25604 legval 29104 vieta 34323 locfinref 34584 oms0 35040 bnj105 35466 ssoninhaus 37451 onint1 37452 bj-tagex 38115 bj-1uplex 38136 rrnval 39027 dvnprodlem3 47231 ioorrnopn 47588 ioorrnopnxr 47590 ismeannd 47750 nelsubc3 50516 setc1ohomfval 50959 |
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