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| Mirrors > Home > ILE Home > Th. List > p0ex | Unicode version | ||
| Description: The power set of the empty set (the ordinal 1) is a set. (Contributed by NM, 23-Dec-1993.) |
| Ref | Expression |
|---|---|
| p0ex |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pw0 3862 |
. 2
| |
| 2 | 0ex 4260 |
. . 3
| |
| 3 | 2 | pwex 4320 |
. 2
|
| 4 | 1, 3 | eqeltrri 2312 |
1
|
| Colors of variables: wff set class |
| This proof depends on syntax axioms:
|
| 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 4249 ax-nul 4259 ax-pow 4311 |
| 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 4326 undifexmid 4330 exmidexmid 4333 exmidundif 4343 exmidundifim 4344 exmid1stab 4345 ordtriexmidlem 4666 ontr2exmid 4672 onsucsssucexmid 4674 onsucelsucexmid 4677 regexmidlemm 4679 ordsoexmid 4709 ordtri2or2exmid 4718 ontri2orexmidim 4719 opthprc 4826 acexmidlema 6076 acexmidlem2 6082 tposexg 6529 2dom 7093 map1 7101 endisj 7122 ssfiexmid 7178 ssfiexmidt 7180 domfiexmid 7182 exmidpw 7215 exmidpw2en 7219 djuex 7383 exmidomni 7482 exmidonfinlem 7545 exmidfodomrlemr 7554 exmidfodomrlemrALT 7555 exmidaclem 7564 pw1dom2 7586 pw1ne1 7588 wexmiddiffilem 17043 sbthom 17071 |
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