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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 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pw0 3739 |
. 2
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2 | 0ex 4128 |
. . 3
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3 | 2 | pwex 4181 |
. 2
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4 | 1, 3 | eqeltrri 2251 |
1
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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 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-14 2151 ax-ext 2159 ax-sep 4119 ax-nul 4127 ax-pow 4172 |
This theorem depends on definitions: df-bi 117 df-tru 1356 df-nf 1461 df-sb 1763 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-v 2739 df-dif 3131 df-in 3135 df-ss 3142 df-nul 3423 df-pw 3577 df-sn 3598 |
This theorem is referenced by: pp0ex 4187 undifexmid 4191 exmidexmid 4194 exmidundif 4204 exmidundifim 4205 exmid1stab 4206 ordtriexmidlem 4516 ontr2exmid 4522 onsucsssucexmid 4524 onsucelsucexmid 4527 regexmidlemm 4529 ordsoexmid 4559 ordtri2or2exmid 4568 ontri2orexmidim 4569 opthprc 4675 acexmidlema 5861 acexmidlem2 5867 tposexg 6254 2dom 6800 map1 6807 endisj 6819 ssfiexmid 6871 domfiexmid 6873 exmidpw 6903 djuex 7037 exmidomni 7135 exmidonfinlem 7187 exmidfodomrlemr 7196 exmidfodomrlemrALT 7197 exmidaclem 7202 pw1dom2 7221 pw1ne1 7223 sbthom 14545 |
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