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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 5327. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4755 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5242 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5322 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2833 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2114 Vcvv 3429 ∅c0 4273 𝒫 cpw 4541 {csn 4567 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2715 df-cleq 2728 df-clel 2811 df-v 3431 df-dif 3892 df-ss 3906 df-nul 4274 df-pw 4543 df-sn 4568 |
| This theorem is referenced by: pp0ex 5328 dtruALT 5330 zfpair 5363 tposexg 8190 fsetexb 8811 endisj 9002 pw2eng 9021 dfac4 10044 dfac2b 10053 axcc2lem 10358 axdc2lem 10370 axcclem 10379 axpowndlem3 10522 isstruct2 17119 cat1 18064 plusffval 18614 grpinvfval 18954 grpsubfval 18959 mulgfval 19045 0symgefmndeq 19369 staffval 20818 scaffval 20875 ipffval 21628 refun0 23480 filconn 23848 alexsubALTlem2 24013 nmfval 24553 tcphex 25184 tchnmfval 25195 legval 28652 vieta 33724 locfinref 33985 oms0 34441 bnj105 34867 ssoninhaus 36630 onint1 36631 bj-tagex 37294 bj-1uplex 37315 rrnval 38148 dvnprodlem3 46376 ioorrnopn 46733 ioorrnopnxr 46735 ismeannd 46895 nelsubc3 49546 setc1ohomfval 49968 |
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