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Mirrors > Home > ILE Home > Th. List > snssi | Unicode version |
Description: The singleton of an element of a class is a subset of the class. (Contributed by NM, 6-Jun-1994.) |
Ref | Expression |
---|---|
snssi |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | snssg 3522 | . 2 | |
2 | 1 | ibi 174 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wcel 1433 wss 2973 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-in 2979 df-ss 2986 df-sn 3404 |
This theorem is referenced by: difsnss 3531 sssnm 3546 tpssi 3551 snelpwi 3967 intid 3979 ordsucss 4248 xpsspw 4468 djussxp 4499 xpimasn 4789 fconst6g 5105 fvimacnvi 5302 fsn2 5358 fnressn 5370 fsnunf 5383 unsnfidcel 6386 axresscn 7028 nn0ssre 8292 1fv 9149 1exp 9505 |
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