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Mirrors > Home > ILE Home > Th. List > 0ex | Unicode version |
Description: The Null Set Axiom of ZF set theory: the empty set exists. Corollary 5.16 of [TakeutiZaring] p. 20. For the unabbreviated version, see ax-nul 3883. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 9-Jul-2011.) |
Ref | Expression |
---|---|
0ex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-nul 3883 | . . 3 | |
2 | eq0 3239 | . . . 4 | |
3 | 2 | exbii 1496 | . . 3 |
4 | 1, 3 | mpbir 134 | . 2 |
5 | 4 | issetri 2564 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wal 1241 wceq 1243 wex 1381 wcel 1393 cvv 2557 c0 3224 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 ax-io 630 ax-5 1336 ax-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 ax-nul 3883 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-v 2559 df-dif 2920 df-nul 3225 |
This theorem is referenced by: 0elpw 3917 0nep0 3918 iin0r 3922 intv 3923 snexprc 3938 p0ex 3939 0elon 4129 onm 4138 ordtriexmidlem2 4246 ordtriexmid 4247 ordtri2orexmid 4248 ontr2exmid 4250 onsucsssucexmid 4252 onsucelsucexmidlem1 4253 onsucelsucexmid 4255 regexmidlem1 4258 reg2exmidlema 4259 ordsoexmid 4286 0elsucexmid 4289 ordpwsucexmid 4294 ordtri2or2exmid 4296 peano1 4317 finds 4323 finds2 4324 0elnn 4340 opthprc 4391 nfunv 4933 fun0 4957 acexmidlema 5503 acexmidlemb 5504 acexmidlemab 5506 ovprc 5540 1st0 5771 2nd0 5772 brtpos0 5867 reldmtpos 5868 tfr0 5937 rdg0 5974 frec0g 5983 1n0 6016 el1o 6020 fnom 6030 omexg 6031 om0 6038 nnsucsssuc 6071 en0 6275 ensn1 6276 en1 6279 2dom 6285 xp1en 6297 endisj 6298 php5dom 6325 ssfiexmid 6336 diffitest 6344 ac6sfi 6352 indpi 6440 frecfzennn 9203 bj-d0clsepcl 10049 bj-indint 10055 bj-bdfindis 10072 bj-inf2vnlem1 10095 |
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