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Mirrors > Home > ILE Home > Th. List > dmrnssfld | Unicode version |
Description: The domain and range of a class are included in its double union. (Contributed by NM, 13-May-2008.) |
Ref | Expression |
---|---|
dmrnssfld |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 2692 |
. . . . 5
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2 | 1 | eldm2 4745 |
. . . 4
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3 | 1 | prid1 3637 |
. . . . . 6
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4 | vex 2692 |
. . . . . . . . . 10
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5 | 1, 4 | uniop 4185 |
. . . . . . . . 9
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6 | 1, 4 | uniopel 4186 |
. . . . . . . . 9
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7 | 5, 6 | eqeltrrid 2228 |
. . . . . . . 8
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8 | elssuni 3772 |
. . . . . . . 8
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9 | 7, 8 | syl 14 |
. . . . . . 7
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10 | 9 | sseld 3101 |
. . . . . 6
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11 | 3, 10 | mpi 15 |
. . . . 5
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12 | 11 | exlimiv 1578 |
. . . 4
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13 | 2, 12 | sylbi 120 |
. . 3
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14 | 13 | ssriv 3106 |
. 2
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15 | 4 | elrn2 4789 |
. . . 4
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16 | 4 | prid2 3638 |
. . . . . 6
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17 | 9 | sseld 3101 |
. . . . . 6
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18 | 16, 17 | mpi 15 |
. . . . 5
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19 | 18 | exlimiv 1578 |
. . . 4
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20 | 15, 19 | sylbi 120 |
. . 3
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21 | 20 | ssriv 3106 |
. 2
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22 | 14, 21 | unssi 3256 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
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 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-sep 4054 ax-pow 4106 ax-pr 4139 |
This theorem depends on definitions: df-bi 116 df-3an 965 df-tru 1335 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-rex 2423 df-v 2691 df-un 3080 df-in 3082 df-ss 3089 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-br 3938 df-opab 3998 df-cnv 4555 df-dm 4557 df-rn 4558 |
This theorem is referenced by: dmexg 4811 rnexg 4812 relfld 5075 relcoi2 5077 |
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