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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 5358. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4780 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5272 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5353 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2862 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2146 Vcvv 3457 ∅c0 4286 𝒫 cpw 4564 {csn 4591 |
| 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 2148 ax-9 2156 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 |
| 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 2744 df-cleq 2757 df-clel 2840 df-v 3459 df-dif 3909 df-ss 3923 df-nul 4287 df-pw 4566 df-sn 4592 |
| This theorem is used by: pp0ex 5359 dtruALT 5361 zfpair 5394 tposexg 8242 fsetexb 8867 endisj 9059 pw2eng 9078 dfac4 10122 dfac2b 10130 axcc2lem 10435 axdc2lem 10447 axcclem 10456 axpowndlem3 10599 isstruct2 17231 cat1 18176 plusffval 18726 grpinvfval 19089 grpsubfval 19094 mulgfval 19179 0symgefmndeq 19508 staffval 20994 scaffval 21051 ipffval 21848 refun0 23723 filconn 24091 alexsubALTlem2 24256 nmfval 24796 tcphex 25427 tchnmfval 25438 legval 28904 vieta 34034 locfinref 34295 oms0 34752 bnj105 35178 ssoninhaus 37016 onint1 37017 bj-tagex 37680 bj-1uplex 37701 rrnval 38536 dvnprodlem3 46720 ioorrnopn 47077 ioorrnopnxr 47079 ismeannd 47239 nelsubc3 49906 setc1ohomfval 50328 |
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