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Mirrors > Home > ILE Home > Th. List > iuncom4 | Unicode version |
Description: Commutation of union with indexed union. (Contributed by Mario Carneiro, 18-Jan-2014.) |
Ref | Expression |
---|---|
iuncom4 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-rex 2478 |
. . . . . . 7
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2 | 1 | rexbii 2501 |
. . . . . 6
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3 | rexcom4 2783 |
. . . . . 6
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4 | 2, 3 | bitri 184 |
. . . . 5
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5 | r19.41v 2650 |
. . . . . 6
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6 | 5 | exbii 1616 |
. . . . 5
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7 | 4, 6 | bitri 184 |
. . . 4
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8 | eluni2 3840 |
. . . . 5
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9 | 8 | rexbii 2501 |
. . . 4
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10 | df-rex 2478 |
. . . . 5
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11 | eliun 3917 |
. . . . . . 7
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12 | 11 | anbi1i 458 |
. . . . . 6
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13 | 12 | exbii 1616 |
. . . . 5
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14 | 10, 13 | bitri 184 |
. . . 4
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15 | 7, 9, 14 | 3bitr4i 212 |
. . 3
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16 | eliun 3917 |
. . 3
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17 | eluni2 3840 |
. . 3
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18 | 15, 16, 17 | 3bitr4i 212 |
. 2
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19 | 18 | eqriv 2190 |
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 106 ax-ia2 107 ax-ia3 108 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-ext 2175 |
This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1472 df-sb 1774 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ral 2477 df-rex 2478 df-v 2762 df-uni 3837 df-iun 3915 |
This theorem is referenced by: tgidm 14253 |
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