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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 5342. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex | ⊢ {∅} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 4770 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 5257 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 5337 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2859 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff setvar class |
| Syntax hints: ∈ wcel 2142 Vcvv 3454 ∅c0 4285 𝒫 cpw 4555 {csn 4582 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-ext 2734 ax-sep 5246 ax-nul 5256 ax-pow 5322 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-tru 1563 df-fal 1573 df-ex 1800 df-sb 2091 df-clab 2741 df-cleq 2754 df-clel 2837 df-v 3456 df-dif 3907 df-ss 3921 df-nul 4286 df-pw 4557 df-sn 4583 |
| This theorem is referenced by: pp0ex 5343 dtruALT 5345 zfpair 5378 tposexg 8220 fsetexb 8845 endisj 9036 pw2eng 9055 dfac4 10078 dfac2b 10087 axcc2lem 10393 axdc2lem 10405 axcclem 10414 axpowndlem3 10557 isstruct2 17185 cat1 18130 plusffval 18680 grpinvfval 19020 grpsubfval 19025 mulgfval 19111 0symgefmndeq 19434 staffval 20890 scaffval 20947 ipffval 21700 refun0 23575 filconn 23943 alexsubALTlem2 24108 nmfval 24648 tcphex 25279 tchnmfval 25290 legval 28753 vieta 33877 locfinref 34138 oms0 34594 bnj105 35020 ssoninhaus 36808 onint1 36809 bj-tagex 37472 bj-1uplex 37493 rrnval 38326 dvnprodlem3 46522 ioorrnopn 46879 ioorrnopnxr 46881 ismeannd 47041 nelsubc3 49692 setc1ohomfval 50114 |
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