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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 3825 |
. 2
| |
| 2 | 0ex 4221 |
. . 3
| |
| 3 | 2 | pwex 4279 |
. 2
|
| 4 | 1, 3 | eqeltrri 2305 |
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 2205 ax-ext 2213 ax-sep 4212 ax-nul 4220 ax-pow 4270 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 df-dif 3203 df-in 3207 df-ss 3214 df-nul 3497 df-pw 3658 df-sn 3679 |
| This theorem is referenced by: pp0ex 4285 undifexmid 4289 exmidexmid 4292 exmidundif 4302 exmidundifim 4303 exmid1stab 4304 ordtriexmidlem 4623 ontr2exmid 4629 onsucsssucexmid 4631 onsucelsucexmid 4634 regexmidlemm 4636 ordsoexmid 4666 ordtri2or2exmid 4675 ontri2orexmidim 4676 opthprc 4783 acexmidlema 6019 acexmidlem2 6025 tposexg 6467 2dom 7023 map1 7030 endisj 7051 ssfiexmid 7106 ssfiexmidt 7108 domfiexmid 7110 exmidpw 7143 exmidpw2en 7147 djuex 7302 exmidomni 7401 exmidonfinlem 7464 exmidfodomrlemr 7473 exmidfodomrlemrALT 7474 exmidaclem 7483 pw1dom2 7505 pw1ne1 7507 sbthom 16754 |
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