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Related theorems Unicode version |
| Description: Subset theorem for an indexed intersection. |
| Ref | Expression |
|---|---|
| ssiin |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | visset 1804 |
. . . . . 6
| |
| 2 | eliin 2561 |
. . . . . 6
| |
| 3 | 1, 2 | ax-mp 7 |
. . . . 5
|
| 4 | 3 | imbi2i 185 |
. . . 4
|
| 5 | r19.21v 1708 |
. . . 4
| |
| 6 | df-ral 1641 |
. . . 4
| |
| 7 | 4, 5, 6 | 3bitr2 179 |
. . 3
|
| 8 | 7 | albii 996 |
. 2
|
| 9 | dfss2 2048 |
. 2
| |
| 10 | dfss2 2048 |
. . . 4
| |
| 11 | 10 | ralbii 1659 |
. . 3
|
| 12 | df-ral 1641 |
. . 3
| |
| 13 | 19.21v 1280 |
. . . . 5
| |
| 14 | 13 | albii 996 |
. . . 4
|
| 15 | alcom 1028 |
. . . 4
| |
| 16 | 14, 15 | bitr3 175 |
. . 3
|
| 17 | 11, 12, 16 | 3bitr 177 |
. 2
|
| 18 | 8, 9, 17 | 3bitr4 183 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-10 963 ax-12 965 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-ext 1452 |
| This theorem depends on definitions: df-bi 147 df-an 225 df-ex 978 df-sb 1168 df-clab 1457 df-cleq 1462 df-clel 1465 df-ral 1641 df-v 1803 df-in 2041 df-ss 2043 df-iin 2559 |