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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 3862 | . 2 ⊢ 𝒫 ∅ = {∅} | |
| 2 | 0ex 4262 | . . 3 ⊢ ∅ ∈ V | |
| 3 | 2 | pwex 4322 | . 2 ⊢ 𝒫 ∅ ∈ V |
| 4 | 1, 3 | eqeltrri 2312 | 1 ⊢ {∅} ∈ V |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 Vcvv 2821 ∅c0 3520 𝒫 cpw 3688 {csn 3709 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-nul 4261 ax-pow 4313 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-dif 3222 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3715 |
| This theorem is used by: pp0ex 4328 undifexmid 4332 exmidexmid 4335 exmidundif 4345 exmidundifim 4346 exmid1stab 4347 ordtriexmidlem 4668 ontr2exmid 4674 onsucsssucexmid 4676 onsucelsucexmid 4679 regexmidlemm 4681 ordsoexmid 4711 ordtri2or2exmid 4720 ontri2orexmidim 4721 opthprc 4828 acexmidlema 6079 acexmidlem2 6085 tposexg 6533 2dom 7097 map1 7105 endisj 7126 ssfiexmid 7182 ssfiexmidt 7184 domfiexmid 7186 exmidpw 7219 exmidpw2en 7223 djuex 7389 exmidomni 7488 exmidonfinlem 7551 exmidfodomrlemr 7560 exmidfodomrlemrALT 7561 exmidaclem 7570 pw1dom2 7592 pw1ne1 7594 wexmiddiffilem 17248 sbthom 17277 |
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