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Mirrors > Home > ILE Home > Th. List > equvini | Unicode version |
Description: A variable introduction law for equality. Lemma 15 of [Monk2] p. 109, however we do not require to be distinct from and (making the proof longer). (Contributed by NM, 5-Aug-1993.) (Proof shortened by Andrew Salmon, 25-May-2011.) |
Ref | Expression |
---|---|
equvini |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax12or 1403 | . 2 | |
2 | equcomi 1592 | . . . . . . 7 | |
3 | 2 | alimi 1344 | . . . . . 6 |
4 | a9e 1586 | . . . . . 6 | |
5 | 3, 4 | jctir 296 | . . . . 5 |
6 | 5 | a1d 22 | . . . 4 |
7 | 19.29 1511 | . . . 4 | |
8 | 6, 7 | syl6 29 | . . 3 |
9 | a9e 1586 | . . . . . . . 8 | |
10 | 2 | eximi 1491 | . . . . . . . 8 |
11 | 9, 10 | ax-mp 7 | . . . . . . 7 |
12 | 11 | 2a1i 24 | . . . . . 6 |
13 | 12 | anc2ri 313 | . . . . 5 |
14 | 19.29r 1512 | . . . . 5 | |
15 | 13, 14 | syl6 29 | . . . 4 |
16 | ax-8 1395 | . . . . . . . . . . . 12 | |
17 | 16 | anc2li 312 | . . . . . . . . . . 11 |
18 | 17 | equcoms 1594 | . . . . . . . . . 10 |
19 | 18 | com12 27 | . . . . . . . . 9 |
20 | 19 | alimi 1344 | . . . . . . . 8 |
21 | exim 1490 | . . . . . . . 8 | |
22 | 20, 21 | syl 14 | . . . . . . 7 |
23 | 9, 22 | mpi 15 | . . . . . 6 |
24 | 23 | imim2i 12 | . . . . 5 |
25 | 24 | sps 1430 | . . . 4 |
26 | 15, 25 | jaoi 636 | . . 3 |
27 | 8, 26 | jaoi 636 | . 2 |
28 | 1, 27 | ax-mp 7 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wo 629 wal 1241 wceq 1243 wex 1381 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 99 ax-ia2 100 ax-ia3 101 ax-io 630 ax-5 1336 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-i12 1398 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 |
This theorem depends on definitions: df-bi 110 |
This theorem is referenced by: sbequi 1720 equvin 1743 |
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