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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 1816 |
. . . . 5
| |
| 2 | 1 | eldm2 3314 |
. . . 4
|
| 3 | 1 | pri1 2454 |
. . . . . 6
|
| 4 | uniopel 2815 |
. . . . . . . . 9
| |
| 5 | uniop 2814 |
. . . . . . . . 9
| |
| 6 | 4, 5 | syl5eqelr 1556 |
. . . . . . . 8
|
| 7 | elssuni 2530 |
. . . . . . . 8
| |
| 8 | 6, 7 | syl 10 |
. . . . . . 7
|
| 9 | 8 | sseld 2070 |
. . . . . 6
|
| 10 | 3, 9 | mpi 44 |
. . . . 5
|
| 11 | 10 | 19.23aiv 1297 |
. . . 4
|
| 12 | 2, 11 | sylbi 199 |
. . 3
|
| 13 | 12 | ssriv 2072 |
. 2
|
| 14 | visset 1816 |
. . . . 5
| |
| 15 | 14 | elrn2 3355 |
. . . 4
|
| 16 | 14 | pri2 2455 |
. . . . . 6
|
| 17 | 8 | sseld 2070 |
. . . . . 6
|
| 18 | 16, 17 | mpi 44 |
. . . . 5
|
| 19 | 18 | 19.23aiv 1297 |
. . . 4
|
| 20 | 15, 19 | sylbi 199 |
. . 3
|
| 21 | 20 | ssriv 2072 |
. 2
|
| 22 | 13, 21 | unssi 2208 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: dmexg 3364 rnexg 3365 asymref 3445 asymref2 3446 relfld 3521 psdmrn 8644 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-sep 2708 ax-pow 2748 ax-pr 2785 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-uni 2508 df-br 2625 df-opab 2672 df-cnv 3192 df-dm 3194 df-rn 3195 |