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Mirrors > Home > ILE Home > Th. List > rabun2 | Unicode version |
Description: Abstraction restricted to a union. (Contributed by Stefan O'Rear, 5-Feb-2015.) |
Ref | Expression |
---|---|
rabun2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-rab 2426 |
. 2
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2 | df-rab 2426 |
. . . 4
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3 | df-rab 2426 |
. . . 4
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4 | 2, 3 | uneq12i 3233 |
. . 3
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5 | elun 3222 |
. . . . . . 7
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6 | 5 | anbi1i 454 |
. . . . . 6
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7 | andir 809 |
. . . . . 6
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8 | 6, 7 | bitri 183 |
. . . . 5
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9 | 8 | abbii 2256 |
. . . 4
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10 | unab 3348 |
. . . 4
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11 | 9, 10 | eqtr4i 2164 |
. . 3
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12 | 4, 11 | eqtr4i 2164 |
. 2
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13 | 1, 12 | eqtr4i 2164 |
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-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-tru 1335 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-rab 2426 df-v 2691 df-un 3080 |
This theorem is referenced by: ssfirab 6830 |
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