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Mirrors > Home > ILE Home > Th. List > ceqex | Unicode version |
Description: Equality implies equivalence with substitution. (Contributed by NM, 2-Mar-1995.) |
Ref | Expression |
---|---|
ceqex |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 19.8a 1522 | . . 3 | |
2 | isset 2605 | . . 3 | |
3 | 1, 2 | sylibr 132 | . 2 |
4 | eqeq2 2090 | . . . 4 | |
5 | 4 | anbi1d 452 | . . . . . 6 |
6 | 5 | exbidv 1746 | . . . . 5 |
7 | 6 | bibi2d 230 | . . . 4 |
8 | 4, 7 | imbi12d 232 | . . 3 |
9 | 19.8a 1522 | . . . . 5 | |
10 | 9 | ex 113 | . . . 4 |
11 | vex 2604 | . . . . . 6 | |
12 | 11 | alexeq 2721 | . . . . 5 |
13 | sp 1441 | . . . . . 6 | |
14 | 13 | com12 30 | . . . . 5 |
15 | 12, 14 | syl5bir 151 | . . . 4 |
16 | 10, 15 | impbid 127 | . . 3 |
17 | 8, 16 | vtoclg 2658 | . 2 |
18 | 3, 17 | mpcom 36 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wb 103 wal 1282 wceq 1284 wex 1421 wcel 1433 cvv 2601 |
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 |
This theorem is referenced by: ceqsexg 2723 sbc6g 2839 |
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