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Mirrors > Home > ILE Home > Th. List > dftr5 | Unicode version |
Description: An alternate way of defining a transitive class. (Contributed by NM, 20-Mar-2004.) |
Ref | Expression |
---|---|
dftr5 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dftr2 3856 | . 2 | |
2 | alcom 1367 | . . 3 | |
3 | impexp 250 | . . . . . . . 8 | |
4 | 3 | albii 1359 | . . . . . . 7 |
5 | df-ral 2311 | . . . . . . 7 | |
6 | 4, 5 | bitr4i 176 | . . . . . 6 |
7 | r19.21v 2396 | . . . . . 6 | |
8 | 6, 7 | bitri 173 | . . . . 5 |
9 | 8 | albii 1359 | . . . 4 |
10 | df-ral 2311 | . . . 4 | |
11 | 9, 10 | bitr4i 176 | . . 3 |
12 | 2, 11 | bitri 173 | . 2 |
13 | 1, 12 | bitri 173 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 97 wb 98 wal 1241 wcel 1393 wral 2306 wtr 3854 |
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-7 1337 ax-gen 1338 ax-ie1 1382 ax-ie2 1383 ax-8 1395 ax-10 1396 ax-11 1397 ax-i12 1398 ax-bndl 1399 ax-4 1400 ax-17 1419 ax-i9 1423 ax-ial 1427 ax-i5r 1428 ax-ext 2022 |
This theorem depends on definitions: df-bi 110 df-tru 1246 df-nf 1350 df-sb 1646 df-clab 2027 df-cleq 2033 df-clel 2036 df-nfc 2167 df-ral 2311 df-v 2559 df-in 2924 df-ss 2931 df-uni 3581 df-tr 3855 |
This theorem is referenced by: dftr3 3858 |
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