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Mirrors > Home > ILE Home > Th. List > snnex | Unicode version |
Description: The class of all singletons is a proper class. (Contributed by NM, 10-Oct-2008.) (Proof shortened by Eric Schmidt, 7-Dec-2008.) |
Ref | Expression |
---|---|
snnex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vprc 4060 | . . . 4 | |
2 | vsnid 3557 | . . . . . . . . 9 | |
3 | a9ev 1675 | . . . . . . . . . 10 | |
4 | sneq 3538 | . . . . . . . . . . 11 | |
5 | 4 | equcoms 1684 | . . . . . . . . . 10 |
6 | 3, 5 | eximii 1581 | . . . . . . . . 9 |
7 | vex 2689 | . . . . . . . . . . 11 | |
8 | 7 | snex 4109 | . . . . . . . . . 10 |
9 | eleq2 2203 | . . . . . . . . . . 11 | |
10 | eqeq1 2146 | . . . . . . . . . . . 12 | |
11 | 10 | exbidv 1797 | . . . . . . . . . . 11 |
12 | 9, 11 | anbi12d 464 | . . . . . . . . . 10 |
13 | 8, 12 | spcev 2780 | . . . . . . . . 9 |
14 | 2, 6, 13 | mp2an 422 | . . . . . . . 8 |
15 | eluniab 3748 | . . . . . . . 8 | |
16 | 14, 15 | mpbir 145 | . . . . . . 7 |
17 | 16, 7 | 2th 173 | . . . . . 6 |
18 | 17 | eqriv 2136 | . . . . 5 |
19 | 18 | eleq1i 2205 | . . . 4 |
20 | 1, 19 | mtbir 660 | . . 3 |
21 | uniexg 4361 | . . 3 | |
22 | 20, 21 | mto 651 | . 2 |
23 | 22 | nelir 2406 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 103 wceq 1331 wex 1468 wcel 1480 cab 2125 wnel 2403 cvv 2686 csn 3527 cuni 3736 |
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-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-un 4355 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-nel 2404 df-rex 2422 df-v 2688 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-uni 3737 |
This theorem is referenced by: fiprc 6709 |
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