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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 5356. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4778 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5270 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5351 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2860 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2143 Vcvv 3455 ∅c0 4286 𝒫 cpw 4562 {csn 4589 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pow 5336 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-tru 1573 df-fal 1583 df-ex 1810 df-sb 2097 df-clab 2742 df-cleq 2755 df-clel 2838 df-v 3457 df-dif 3908 df-ss 3922 df-nul 4287 df-pw 4564 df-sn 4590 |
| This theorem is referenced by: pp0ex 5357 dtruALT 5359 zfpair 5392 tposexg 8232 fsetexb 8857 endisj 9048 pw2eng 9067 dfac4 10102 dfac2b 10110 axcc2lem 10415 axdc2lem 10427 axcclem 10436 axpowndlem3 10579 isstruct2 17204 cat1 18149 plusffval 18699 grpinvfval 19040 grpsubfval 19045 mulgfval 19130 0symgefmndeq 19459 staffval 20944 scaffval 21001 ipffval 21798 refun0 23672 filconn 24040 alexsubALTlem2 24205 nmfval 24745 tcphex 25376 tchnmfval 25387 legval 28853 vieta 33970 locfinref 34231 oms0 34687 bnj105 35113 ssoninhaus 36959 onint1 36960 bj-tagex 37623 bj-1uplex 37644 rrnval 38478 dvnprodlem3 46662 ioorrnopn 47019 ioorrnopnxr 47021 ismeannd 47181 nelsubc3 49849 setc1ohomfval 50271 |
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