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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 3846 |
. 2
| |
| 2 | 0ex 4242 |
. . 3
| |
| 3 | 2 | pwex 4301 |
. 2
|
| 4 | 1, 3 | eqeltrri 2308 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| 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 4233 ax-nul 4241 ax-pow 4292 |
| 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 3216 df-in 3220 df-ss 3227 df-nul 3513 df-pw 3676 df-sn 3700 |
| This theorem is referenced by: pp0ex 4307 undifexmid 4311 exmidexmid 4314 exmidundif 4324 exmidundifim 4325 exmid1stab 4326 ordtriexmidlem 4646 ontr2exmid 4652 onsucsssucexmid 4654 onsucelsucexmid 4657 regexmidlemm 4659 ordsoexmid 4689 ordtri2or2exmid 4698 ontri2orexmidim 4699 opthprc 4806 acexmidlema 6049 acexmidlem2 6055 tposexg 6502 2dom 7059 map1 7067 endisj 7088 ssfiexmid 7144 ssfiexmidt 7146 domfiexmid 7148 exmidpw 7181 exmidpw2en 7185 djuex 7347 exmidomni 7446 exmidonfinlem 7509 exmidfodomrlemr 7518 exmidfodomrlemrALT 7519 exmidaclem 7528 pw1dom2 7550 pw1ne1 7552 sbthom 16932 |
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