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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 3737 | . 2 | |
2 | exancom 1587 | . . . 4 | |
3 | df-rex 2422 | . . . 4 | |
4 | 2, 3 | bitr4i 186 | . . 3 |
5 | 4 | abbii 2255 | . 2 |
6 | 1, 5 | eqtri 2160 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 103 wceq 1331 wex 1468 wcel 1480 cab 2125 wrex 2417 cuni 3736 |
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 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-11 1484 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-rex 2422 df-uni 3737 |
This theorem is referenced by: nfuni 3742 nfunid 3743 unieq 3745 uniiun 3866 |
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