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Mirrors > Home > ILE Home > Th. List > iuncom4 | Unicode version |
Description: Commutation of union with indexed union. (Contributed by Mario Carneiro, 18-Jan-2014.) |
Ref | Expression |
---|---|
iuncom4 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-rex 2420 | . . . . . . 7 | |
2 | 1 | rexbii 2440 | . . . . . 6 |
3 | rexcom4 2704 | . . . . . 6 | |
4 | 2, 3 | bitri 183 | . . . . 5 |
5 | r19.41v 2585 | . . . . . 6 | |
6 | 5 | exbii 1584 | . . . . 5 |
7 | 4, 6 | bitri 183 | . . . 4 |
8 | eluni2 3735 | . . . . 5 | |
9 | 8 | rexbii 2440 | . . . 4 |
10 | df-rex 2420 | . . . . 5 | |
11 | eliun 3812 | . . . . . . 7 | |
12 | 11 | anbi1i 453 | . . . . . 6 |
13 | 12 | exbii 1584 | . . . . 5 |
14 | 10, 13 | bitri 183 | . . . 4 |
15 | 7, 9, 14 | 3bitr4i 211 | . . 3 |
16 | eliun 3812 | . . 3 | |
17 | eluni2 3735 | . . 3 | |
18 | 15, 16, 17 | 3bitr4i 211 | . 2 |
19 | 18 | eqriv 2134 | 1 |
Colors of variables: wff set class |
Syntax hints: wa 103 wceq 1331 wex 1468 wcel 1480 wrex 2415 cuni 3731 ciun 3808 |
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-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 2119 |
This theorem depends on definitions: df-bi 116 df-tru 1334 df-nf 1437 df-sb 1736 df-clab 2124 df-cleq 2130 df-clel 2133 df-nfc 2268 df-ral 2419 df-rex 2420 df-v 2683 df-uni 3732 df-iun 3810 |
This theorem is referenced by: tgidm 12232 |
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