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| Description: The range of a union. Part of Exercise 8 of [Enderton] p. 41. |
| Ref | Expression |
|---|---|
| rnuni |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eluni 3401 |
. . . . . 6
| |
| 2 | 1 | exbii 1716 |
. . . . 5
|
| 3 | excom 1711 |
. . . . 5
| |
| 4 | ancom 510 |
. . . . . . 7
| |
| 5 | 19.41v 1982 |
. . . . . . 7
| |
| 6 | visset 2572 |
. . . . . . . . 9
| |
| 7 | 6 | elrn2 4349 |
. . . . . . . 8
|
| 8 | 7 | anbi2i 804 |
. . . . . . 7
|
| 9 | 4, 5, 8 | 3bitr4i 340 |
. . . . . 6
|
| 10 | 9 | exbii 1716 |
. . . . 5
|
| 11 | 2, 3, 10 | 3bitri 334 |
. . . 4
|
| 12 | df-rex 2390 |
. . . 4
| |
| 13 | 11, 12 | bitr4i 310 |
. . 3
|
| 14 | 6 | elrn2 4349 |
. . 3
|
| 15 | eliun 3472 |
. . 3
| |
| 16 | 13, 14, 15 | 3bitr4i 340 |
. 2
|
| 17 | 16 | eqriv 2167 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: axdc3lem2 6377 infxpidmlem6OLD 9356 axfelem21 14966 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1621 ax-gen 1622 ax-8 1623 ax-9 1624 ax-10 1625 ax-11 1626 ax-12 1627 ax-14 1629 ax-17 1634 ax-4 1637 ax-5o 1639 ax-6o 1642 ax-9o 1792 ax-10o 1810 ax-16 1883 ax-11o 1893 ax-ext 2152 ax-sep 3638 ax-nul 3645 ax-pow 3681 ax-pr 3719 |
| This theorem depends on definitions: df-bi 232 df-or 434 df-an 435 df-ex 1645 df-sb 1845 df-eu 2070 df-mo 2071 df-clab 2158 df-cleq 2163 df-clel 2166 df-ne 2297 df-ral 2389 df-rex 2390 df-v 2571 df-dif 2862 df-un 2864 df-in 2866 df-ss 2868 df-nul 3115 df-pw 3261 df-sn 3274 df-pr 3275 df-op 3278 df-uni 3399 df-iun 3470 df-br 3540 df-opab 3598 df-cnv 4167 df-dm 4169 df-rn 4170 |