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Mirrors > Home > ILE Home > Th. List > p0ex | GIF version |
Description: The power set of the empty set (the ordinal 1) is a set. (Contributed by NM, 23-Dec-1993.) |
Ref | Expression |
---|---|
p0ex | ⊢ {∅} ∈ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pw0 3532 | . 2 ⊢ 𝒫 ∅ = {∅} | |
2 | 0ex 3905 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | pwex 3953 | . 2 ⊢ 𝒫 ∅ ∈ V |
4 | 1, 3 | eqeltrri 2152 | 1 ⊢ {∅} ∈ V |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1433 Vcvv 2601 ∅c0 3251 𝒫 cpw 3382 {csn 3398 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-sep 3896 ax-nul 3904 ax-pow 3948 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-v 2603 df-dif 2975 df-in 2979 df-ss 2986 df-nul 3252 df-pw 3384 df-sn 3404 |
This theorem is referenced by: pp0ex 3960 ordtriexmidlem 4263 ontr2exmid 4268 onsucsssucexmid 4270 onsucelsucexmid 4273 regexmidlemm 4275 ordsoexmid 4305 ordtri2or2exmid 4314 opthprc 4409 acexmidlema 5523 acexmidlem2 5529 tposexg 5896 2dom 6308 endisj 6321 ssfiexmid 6361 domfiexmid 6363 |
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