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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 3843 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 4239 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 4298 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2308 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2205 Vcvv 2815 ∅c0 3510 𝒫 cpw 3671 {csn 3691 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2208 ax-ext 2216 ax-sep 4230 ax-nul 4238 ax-pow 4289 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-v 2817 df-dif 3215 df-in 3219 df-ss 3226 df-nul 3511 df-pw 3673 df-sn 3697 |
| This theorem is referenced by: pp0ex 4304 undifexmid 4308 exmidexmid 4311 exmidundif 4321 exmidundifim 4322 exmid1stab 4323 ordtriexmidlem 4643 ontr2exmid 4649 onsucsssucexmid 4651 onsucelsucexmid 4654 regexmidlemm 4656 ordsoexmid 4686 ordtri2or2exmid 4695 ontri2orexmidim 4696 opthprc 4803 acexmidlema 6043 acexmidlem2 6049 tposexg 6491 2dom 7048 map1 7056 endisj 7077 ssfiexmid 7133 ssfiexmidt 7135 domfiexmid 7137 exmidpw 7170 exmidpw2en 7174 djuex 7336 exmidomni 7435 exmidonfinlem 7498 exmidfodomrlemr 7507 exmidfodomrlemrALT 7508 exmidaclem 7517 pw1dom2 7539 pw1ne1 7541 sbthom 16823 |
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