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| Description: A set is a member of its singleton. Part of Theorem 7.6 of [Quine] p. 49. |
| Ref | Expression |
|---|---|
| snid.1 |
|
| Ref | Expression |
|---|---|
| snid |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snid.1 |
. 2
| |
| 2 | snidb 3068 |
. 2
| |
| 3 | 1, 2 | mpbi 206 |
1
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| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: tpid3OLD 3117 sneqr 3147 reucl 3213 elALT 3494 rext 3502 unipw 3504 intid 3512 opth1 3531 opprc3 3543 frirr 3634 sucidOLD 3745 sucidOLDOLD 3746 sucidOLDOLDOLD 3747 snsn0non 3788 snsn0nonOLD 3789 snnex 3801 euuni 3807 opthprc 4046 fvsn 4758 fvsnun1 4764 fsn 4807 fsn2 4809 fnressn 4812 fressnfv 4813 tfrlem11 5129 mapsn 5404 0elixp 5419 ac6sfilem3 5508 elirrv 5700 infeq5 5727 kmlem2 5928 axpowndlem3 6103 xrsupss 7287 xrinfmss 7288 acdc3lem 8754 acdc2lem1 8757 acdclem 8763 grpsn 9340 ringsn 9490 dif1enOLD 10173 indexfi 10174 zrdivrng 10418 hsn0elch 10753 bnj143 12475 bnj97 13220 bnj547 13273 bnj966 13348 bnj1442 13540 bnj1498 13562 ghomsn 13631 fvrn0 13837 wfrlem14 13970 wfrlem16 13972 limvinlv 14941 dtt2 14951 singempcon 14965 idtrgrp 14978 invtrgrp 14979 1ded 15085 alexsublem4 15440 locfindsc 15515 comppfsc 15517 ist1-2 15542 isufil2 15565 ufileu 15573 uffixfr 15575 ufinffr 15578 indexfiOLD 15755 zornn0 15764 heiborlem18 15972 bfp 16009 ismrer1 16024 grpkerinj 16042 0idl 16173 0ring 16175 snsslVD 16652 snssl 16653 unipwrVD 16656 unipwr 16657 sucidALTVD 16694 sucidALT 16695 sucidVD 16696 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-ex 1327 df-sb 1536 df-clab 1872 df-cleq 1877 df-clel 1880 df-v 2294 df-sn 3049 |