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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 2724 | . 2 | |
2 | 1 | elsn 3586 | 1 |
Colors of variables: wff set class |
Syntax hints: wb 104 wceq 1342 wcel 2135 csn 3570 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-v 2723 df-sn 3576 |
This theorem is referenced by: dfpr2 3589 mosn 3606 ralsnsg 3607 ralsns 3608 rexsns 3609 disjsn 3632 snprc 3635 euabsn2 3639 prmg 3691 snss 3696 difprsnss 3705 eqsnm 3729 snsssn 3735 snsspw 3738 dfnfc2 3801 uni0b 3808 uni0c 3809 sndisj 3972 unidif0 4140 exmid01 4171 rext 4187 exss 4199 frirrg 4322 ordsucim 4471 ordtriexmidlem 4490 ordtri2or2exmidlem 4497 onsucelsucexmidlem 4500 elirr 4512 sucprcreg 4520 fconstmpt 4645 opeliunxp 4653 dmsnopg 5069 dfmpt3 5304 nfunsn 5514 fsn 5651 fnasrn 5657 fnasrng 5659 fconstfvm 5697 eusvobj2 5822 opabex3d 6081 opabex3 6082 dcdifsnid 6463 ecexr 6497 ixp0x 6683 xpsnen 6778 fidifsnen 6827 difinfsn 7056 exmidonfinlem 7140 iccid 9852 fzsn 9991 fzpr 10002 fzdifsuc 10006 fsum2dlemstep 11361 prodsnf 11519 fprod1p 11526 fprodunsn 11531 fprod2dlemstep 11549 ef0lem 11587 1nprm 12025 restsn 12721 |
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