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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 5320. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4761 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5242 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5315 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2825 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2109 Vcvv 3433 ∅c0 4280 𝒫 cpw 4547 {csn 4573 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-ext 2701 ax-sep 5231 ax-nul 5241 ax-pow 5300 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1543 df-fal 1553 df-ex 1780 df-sb 2066 df-clab 2708 df-cleq 2721 df-clel 2803 df-v 3435 df-dif 3902 df-ss 3916 df-nul 4281 df-pw 4549 df-sn 4574 |
| This theorem is referenced by: pp0ex 5321 dtruALT 5323 zfpair 5356 tposexg 8164 fsetexb 8782 endisj 8971 pw2eng 8990 dfac4 10004 dfac2b 10013 axcc2lem 10318 axdc2lem 10330 axcclem 10339 axpowndlem3 10481 isstruct2 17047 cat1 17991 plusffval 18507 grpinvfval 18844 grpsubfval 18849 mulgfval 18935 0symgefmndeq 19260 staffval 20710 scaffval 20767 lpival 21215 ipffval 21539 refun0 23384 filconn 23752 alexsubALTlem2 23917 nmfval 24457 tcphex 25098 tchnmfval 25109 legval 28516 locfinref 33822 oms0 34278 bnj105 34704 ssoninhaus 36439 onint1 36440 bj-tagex 36978 bj-1uplex 36999 rrnval 37824 lsatset 38986 mnuprdlem2 44263 mnuprdlem3 44264 dvnprodlem3 45943 ioorrnopn 46300 ioorrnopnxr 46302 ismeannd 46462 nelsubc3 49070 setc1ohomfval 49492 |
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