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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 3675 | . 2 ⊢ 𝒫 ∅ = {∅} | |
2 | 0ex 4063 | . . 3 ⊢ ∅ ∈ V | |
3 | 2 | pwex 4115 | . 2 ⊢ 𝒫 ∅ ∈ V |
4 | 1, 3 | eqeltrri 2214 | 1 ⊢ {∅} ∈ V |
Colors of variables: wff set class |
Syntax hints: ∈ wcel 1481 Vcvv 2689 ∅c0 3368 𝒫 cpw 3515 {csn 3532 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-nul 4062 ax-pow 4106 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-v 2691 df-dif 3078 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 |
This theorem is referenced by: pp0ex 4121 undifexmid 4125 exmidexmid 4128 exmidundif 4137 exmidundifim 4138 ordtriexmidlem 4443 ontr2exmid 4448 onsucsssucexmid 4450 onsucelsucexmid 4453 regexmidlemm 4455 ordsoexmid 4485 ordtri2or2exmid 4494 opthprc 4598 acexmidlema 5773 acexmidlem2 5779 tposexg 6163 2dom 6707 map1 6714 endisj 6726 ssfiexmid 6778 domfiexmid 6780 exmidpw 6810 djuex 6936 exmidomni 7022 exmidonfinlem 7066 exmidfodomrlemr 7075 exmidfodomrlemrALT 7076 exmidaclem 7081 pw1dom2 13361 exmid1stab 13368 sbthom 13396 |
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