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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 5347. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4773 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5261 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5342 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2858 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2145 Vcvv 3451 ∅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 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 |
| 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 2740 df-cleq 2753 df-clel 2836 df-v 3453 df-dif 3902 df-ss 3916 df-nul 4280 df-pw 4559 df-sn 4585 |
| This theorem is used by: pp0ex 5348 dtruALT 5350 zfpair 5383 tposexg 8257 fsetexb 8886 endisj 9083 pw2eng 9102 dfac4 10201 dfac2b 10209 axcc2lem 10514 axdc2lem 10526 axcclem 10535 axpowndlem3 10684 isstruct2 17327 cat1 18272 plusffval 18822 grpinvfval 19189 grpsubfval 19194 mulgfval 19279 0symgefmndeq 19608 staffval 21098 scaffval 21155 ipffval 21954 refun0 23834 filconn 24202 alexsubALTlem2 24367 nmfval 24907 tcphex 25538 tchnmfval 25549 legval 29047 vieta 34212 locfinref 34473 oms0 34929 bnj105 35355 ssoninhaus 37236 onint1 37237 bj-tagex 37900 bj-1uplex 37921 rrnval 38761 dvnprodlem3 46957 ioorrnopn 47314 ioorrnopnxr 47316 ismeannd 47476 nelsubc3 50178 setc1ohomfval 50600 |
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