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Mirrors > Home > ILE Home > Th. List > 0iun | Unicode version |
Description: An empty indexed union is empty. (Contributed by NM, 4-Dec-2004.) (Proof shortened by Andrew Salmon, 25-Jul-2011.) |
Ref | Expression |
---|---|
0iun |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rex0 3380 | . . . 4 | |
2 | eliun 3817 | . . . 4 | |
3 | 1, 2 | mtbir 660 | . . 3 |
4 | noel 3367 | . . 3 | |
5 | 3, 4 | 2false 690 | . 2 |
6 | 5 | eqriv 2136 | 1 |
Colors of variables: wff set class |
Syntax hints: wceq 1331 wcel 1480 wrex 2417 c0 3363 ciun 3813 |
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-in1 603 ax-in2 604 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-fal 1337 df-nf 1437 df-sb 1736 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ral 2421 df-rex 2422 df-v 2688 df-dif 3073 df-nul 3364 df-iun 3815 |
This theorem is referenced by: iununir 3896 rdg0 6284 iunfidisj 6834 fsum2d 11204 fsumiun 11246 iuncld 12284 |
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