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Mirrors > Home > ILE Home > Th. List > dfss4st | Unicode version |
Description: Subclass defined in terms of class difference. (Contributed by NM, 22-Mar-1998.) (Proof shortened by Andrew Salmon, 26-Jun-2011.) |
Ref | Expression |
---|---|
dfss4st | STAB |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1w 2198 | . . . 4 | |
2 | 1 | stbid 817 | . . 3 STAB STAB |
3 | 2 | cbvalv 1889 | . 2 STAB STAB |
4 | nfa1 1521 | . . . . 5 STAB | |
5 | nfcv 2279 | . . . . 5 | |
6 | nfcv 2279 | . . . . 5 | |
7 | eldif 3075 | . . . . . . 7 | |
8 | elin 3254 | . . . . . . . . . 10 | |
9 | abai 549 | . . . . . . . . . 10 | |
10 | 8, 9 | bitri 183 | . . . . . . . . 9 |
11 | imanst 873 | . . . . . . . . . 10 STAB | |
12 | 11 | anbi2d 459 | . . . . . . . . 9 STAB |
13 | 10, 12 | syl5bb 191 | . . . . . . . 8 STAB |
14 | eldif 3075 | . . . . . . . . . 10 | |
15 | 14 | notbii 657 | . . . . . . . . 9 |
16 | 15 | anbi2i 452 | . . . . . . . 8 |
17 | 13, 16 | syl6rbbr 198 | . . . . . . 7 STAB |
18 | 7, 17 | syl5bb 191 | . . . . . 6 STAB |
19 | 18 | sps 1517 | . . . . 5 STAB |
20 | 4, 5, 6, 19 | eqrd 3110 | . . . 4 STAB |
21 | 20 | eqeq1d 2146 | . . 3 STAB |
22 | sseqin2 3290 | . . 3 | |
23 | 21, 22 | syl6rbbr 198 | . 2 STAB |
24 | 3, 23 | sylbi 120 | 1 STAB |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 103 wb 104 STAB wstab 815 wal 1329 wceq 1331 wcel 1480 cdif 3063 cin 3065 wss 3066 |
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-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2119 |
This theorem depends on definitions: df-bi 116 df-stab 816 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-v 2683 df-dif 3068 df-in 3072 df-ss 3079 |
This theorem is referenced by: sbthlemi3 6840 |
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