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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 3841 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 4237 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 4296 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2306 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2203 Vcvv 2813 ∅c0 3508 𝒫 cpw 3669 {csn 3689 |
| 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 2206 ax-ext 2214 ax-sep 4228 ax-nul 4236 ax-pow 4287 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2219 df-cleq 2225 df-clel 2228 df-nfc 2373 df-v 2815 df-dif 3213 df-in 3217 df-ss 3224 df-nul 3509 df-pw 3671 df-sn 3695 |
| This theorem is referenced by: pp0ex 4302 undifexmid 4306 exmidexmid 4309 exmidundif 4319 exmidundifim 4320 exmid1stab 4321 ordtriexmidlem 4641 ontr2exmid 4647 onsucsssucexmid 4649 onsucelsucexmid 4652 regexmidlemm 4654 ordsoexmid 4684 ordtri2or2exmid 4693 ontri2orexmidim 4694 opthprc 4801 acexmidlema 6041 acexmidlem2 6047 tposexg 6489 2dom 7046 map1 7054 endisj 7075 ssfiexmid 7131 ssfiexmidt 7133 domfiexmid 7135 exmidpw 7168 exmidpw2en 7172 djuex 7334 exmidomni 7433 exmidonfinlem 7496 exmidfodomrlemr 7505 exmidfodomrlemrALT 7506 exmidaclem 7515 pw1dom2 7537 pw1ne1 7539 sbthom 16806 |
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