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Related theorems Unicode version |
| Description: The domain and range of a class are included in its double union. |
| Ref | Expression |
|---|---|
| dmrnssfld |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | visset 1813 |
. . . . 5
| |
| 2 | 1 | eldm2 3308 |
. . . 4
|
| 3 | 1 | pri1 2450 |
. . . . . 6
|
| 4 | uniopel 2809 |
. . . . . . . . 9
| |
| 5 | uniop 2808 |
. . . . . . . . 9
| |
| 6 | 4, 5 | syl5eqelr 1553 |
. . . . . . . 8
|
| 7 | elssuni 2526 |
. . . . . . . 8
| |
| 8 | 6, 7 | syl 10 |
. . . . . . 7
|
| 9 | 8 | sseld 2067 |
. . . . . 6
|
| 10 | 3, 9 | mpi 44 |
. . . . 5
|
| 11 | 10 | 19.23aiv 1295 |
. . . 4
|
| 12 | 2, 11 | sylbi 199 |
. . 3
|
| 13 | 12 | ssriv 2069 |
. 2
|
| 14 | visset 1813 |
. . . . 5
| |
| 15 | 14 | elrn2 3349 |
. . . 4
|
| 16 | 14 | pri2 2451 |
. . . . . 6
|
| 17 | 8 | sseld 2067 |
. . . . . 6
|
| 18 | 16, 17 | mpi 44 |
. . . . 5
|
| 19 | 18 | 19.23aiv 1295 |
. . . 4
|
| 20 | 15, 19 | sylbi 199 |
. . 3
|
| 21 | 20 | ssriv 2069 |
. 2
|
| 22 | 13, 21 | unssi 2205 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: dmexg 3358 rnexg 3359 asymref 3439 asymref2 3440 relfld 3515 psdmrn 8648 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-sep 2703 ax-pow 2742 ax-pr 2779 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-uni 2504 df-br 2620 df-opab 2667 df-cnv 3186 df-dm 3188 df-rn 3189 |