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Mirrors > Home > ILE Home > Th. List > dfuni2 | Unicode version |
Description: Alternate definition of class union. (Contributed by NM, 28-Jun-1998.) |
Ref | Expression |
---|---|
dfuni2 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-uni 3784 | . 2 | |
2 | exancom 1595 | . . . 4 | |
3 | df-rex 2448 | . . . 4 | |
4 | 2, 3 | bitr4i 186 | . . 3 |
5 | 4 | abbii 2280 | . 2 |
6 | 1, 5 | eqtri 2185 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 103 wceq 1342 wex 1479 wcel 2135 cab 2150 wrex 2443 cuni 3783 |
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-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-11 1493 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-rex 2448 df-uni 3784 |
This theorem is referenced by: nfuni 3789 nfunid 3790 unieq 3792 uniiun 3913 |
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