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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 4829 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5260 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5342 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2857 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∈ wcel 2144 Vcvv 3450 ∅c0 4277 𝒫 cpw 4556 {csn 4584 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5327 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1572 df-fal 1582 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-v 3452 df-ss 3897 df-dif 4046 df-nul 4278 df-pw 4558 df-sn 4585 |
| This theorem is used by: pp0ex 5348 dtruALT 5350 zfpair 5383 tposexg 8265 fsetexb 8894 endisj 9091 pw2eng 9110 dfac4 10208 dfac2b 10216 axcc2lem 10521 axdc2lem 10533 axcclem 10542 axpowndlem3 10691 isstruct2 17336 cat1 18281 plusffval 18831 grpinvfval 19198 grpsubfval 19203 mulgfval 19288 0symgefmndeq 19617 staffval 21107 scaffval 21164 ipffval 21963 refun0 23843 filconn 24211 alexsubALTlem2 24376 nmfval 24916 tcphex 25547 tchnmfval 25558 legval 29056 vieta 34262 locfinref 34523 oms0 34979 bnj105 35405 ssoninhaus 37360 onint1 37361 bj-tagex 38024 bj-1uplex 38045 rrnval 38898 dvnprodlem3 47094 ioorrnopn 47451 ioorrnopnxr 47453 ismeannd 47613 nelsubc3 50321 setc1ohomfval 50764 |
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