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Mirrors > Home > ILE Home > Th. List > velsn | Unicode version |
Description: There is only one element in a singleton. Exercise 2 of [TakeutiZaring] p. 15. (Contributed by NM, 21-Jun-1993.) |
Ref | Expression |
---|---|
velsn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 2604 | . 2 | |
2 | 1 | elsn 3414 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 103 wceq 1284 wcel 1433 csn 3398 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 |
This theorem depends on definitions: df-bi 115 df-tru 1287 df-nf 1390 df-sb 1686 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-v 2603 df-sn 3404 |
This theorem is referenced by: dfpr2 3417 mosn 3429 ralsnsg 3430 ralsns 3431 rexsns 3432 disjsn 3454 snprc 3457 euabsn2 3461 prmg 3511 snss 3516 difprsnss 3524 eqsnm 3547 snsssn 3553 snsspw 3556 dfnfc2 3619 uni0b 3626 uni0c 3627 sndisj 3781 unidif0 3941 rext 3970 exss 3982 frirrg 4105 ordsucim 4244 ordtriexmidlem 4263 ordtri2or2exmidlem 4269 onsucelsucexmidlem 4272 elirr 4284 sucprcreg 4292 fconstmpt 4405 opeliunxp 4413 dmsnopg 4812 dfmpt3 5041 nfunsn 5228 fsn 5356 fnasrn 5362 fnasrng 5364 fconstfvm 5400 eusvobj2 5518 opabex3d 5768 opabex3 5769 nndifsnid 6103 ecexr 6134 xpsnen 6318 fidifsnen 6355 fidifsnid 6356 iccid 8948 fzsn 9084 fzpr 9094 fzdifsuc 9098 1nprm 10496 |
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