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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 5251. (Contributed by NM, 23-Dec-1993.) |
Ref | Expression |
---|---|
p0ex | ⊢ {∅} ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pw0 4705 | . 2 ⊢ 𝒫 ∅ = {∅} | |
2 | 0ex 5175 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | pwex 5246 | . 2 ⊢ 𝒫 ∅ ∈ V |
4 | 1, 3 | eqeltrri 2887 | 1 ⊢ {∅} ∈ V |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2111 Vcvv 3441 ∅c0 4243 𝒫 cpw 4497 {csn 4525 |
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 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-10 2142 ax-11 2158 ax-12 2175 ax-ext 2770 ax-sep 5167 ax-nul 5174 ax-pow 5231 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 845 df-tru 1541 df-ex 1782 df-nf 1786 df-sb 2070 df-clab 2777 df-cleq 2791 df-clel 2870 df-v 3443 df-dif 3884 df-in 3888 df-ss 3898 df-nul 4244 df-pw 4499 df-sn 4526 |
This theorem is referenced by: pp0ex 5252 dtruALT 5254 zfpair 5287 tposexg 7889 endisj 8587 pw2eng 8606 dfac4 9533 dfac2b 9541 axcc2lem 9847 axdc2lem 9859 axcclem 9868 axpowndlem3 10010 isstruct2 16485 plusffval 17850 grpinvfval 18134 grpsubfval 18139 mulgfval 18218 0symgefmndeq 18514 staffval 19611 scaffval 19645 lpival 20011 ipffval 20337 refun0 22120 filconn 22488 alexsubALTlem2 22653 nmfval 23195 tcphex 23821 tchnmfval 23832 legval 26378 locfinref 31194 oms0 31665 bnj105 32104 ssoninhaus 33909 onint1 33910 bj-tagex 34423 bj-1uplex 34444 rrnval 35265 lsatset 36286 mnuprdlem2 40981 mnuprdlem3 40982 dvnprodlem3 42590 ioorrnopn 42947 ioorrnopnxr 42949 ismeannd 43106 |
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