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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 1569 | . . 3 | |
2 | isset 2692 | . . 3 | |
3 | 1, 2 | sylibr 133 | . 2 |
4 | eqeq2 2149 | . . . 4 | |
5 | 4 | anbi1d 460 | . . . . . 6 |
6 | 5 | exbidv 1797 | . . . . 5 |
7 | 6 | bibi2d 231 | . . . 4 |
8 | 4, 7 | imbi12d 233 | . . 3 |
9 | 19.8a 1569 | . . . . 5 | |
10 | 9 | ex 114 | . . . 4 |
11 | vex 2689 | . . . . . 6 | |
12 | 11 | alexeq 2811 | . . . . 5 |
13 | sp 1488 | . . . . . 6 | |
14 | 13 | com12 30 | . . . . 5 |
15 | 12, 14 | syl5bir 152 | . . . 4 |
16 | 10, 15 | impbid 128 | . . 3 |
17 | 8, 16 | vtoclg 2746 | . 2 |
18 | 3, 17 | mpcom 36 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 103 wb 104 wal 1329 wceq 1331 wex 1468 wcel 1480 cvv 2686 |
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-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 2121 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-v 2688 |
This theorem is referenced by: ceqsexg 2813 sbc6g 2933 |
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