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Mirrors > Home > ILE Home > Th. List > elsni | Unicode version |
Description: There is only one element in a singleton. (Contributed by NM, 5-Jun-1994.) |
Ref | Expression |
---|---|
elsni |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elsng 3413 | . 2 | |
2 | 1 | ibi 174 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 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: elsn2g 3427 disjsn2 3455 sssnm 3546 disjxsn 3783 opth1 3991 elsuci 4158 ordtri2orexmid 4266 onsucsssucexmid 4270 sosng 4431 ressn 4878 funcnvsn 4965 fvconst 5372 fmptap 5374 fmptapd 5375 fvunsng 5378 1stconst 5862 2ndconst 5863 reldmtpos 5891 tpostpos 5902 ac6sfi 6379 onunsnss 6383 snon0 6387 supsnti 6418 elreal2 6999 ax1rid 7043 ltxrlt 7178 un0addcl 8321 un0mulcl 8322 elfzonlteqm1 9219 iseqid3 9465 1exp 9505 divalgmod 10327 bj-nntrans 10746 bj-nnelirr 10748 |
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