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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 5288. (Contributed by NM, 23-Dec-1993.) |
Ref | Expression |
---|---|
p0ex | ⊢ {∅} ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pw0 4747 | . 2 ⊢ 𝒫 ∅ = {∅} | |
2 | 0ex 5213 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | pwex 5283 | . 2 ⊢ 𝒫 ∅ ∈ V |
4 | 1, 3 | eqeltrri 2912 | 1 ⊢ {∅} ∈ V |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2114 Vcvv 3496 ∅c0 4293 𝒫 cpw 4541 {csn 4569 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-v 3498 df-dif 3941 df-in 3945 df-ss 3954 df-nul 4294 df-pw 4543 df-sn 4570 |
This theorem is referenced by: pp0ex 5289 dtruALT 5291 zfpair 5324 tposexg 7908 endisj 8606 pw2eng 8625 dfac4 9550 dfac2b 9558 axcc2lem 9860 axdc2lem 9872 axcclem 9881 axpowndlem3 10023 isstruct2 16495 plusffval 17860 grpinvfval 18144 grpsubfval 18149 mulgfval 18228 0symgefmndeq 18524 staffval 19620 scaffval 19654 lpival 20020 ipffval 20794 refun0 22125 filconn 22493 alexsubALTlem2 22658 nmfval 23200 tcphex 23822 tchnmfval 23833 legval 26372 locfinref 31107 oms0 31557 bnj105 31996 ssoninhaus 33798 onint1 33799 bj-tagex 34301 bj-1uplex 34322 rrnval 35107 lsatset 36128 mnuprdlem2 40616 mnuprdlem3 40617 dvnprodlem3 42240 ioorrnopn 42597 ioorrnopnxr 42599 ismeannd 42756 |
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