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Mirrors > Home > ILE Home > Th. List > triun | Unicode version |
Description: The indexed union of a class of transitive sets is transitive. (Contributed by Mario Carneiro, 16-Nov-2014.) |
Ref | Expression |
---|---|
triun |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eliun 3825 |
. . . 4
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2 | r19.29 2572 |
. . . . 5
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3 | nfcv 2282 |
. . . . . . 7
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4 | nfiu1 3851 |
. . . . . . 7
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5 | 3, 4 | nfss 3095 |
. . . . . 6
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6 | trss 4043 |
. . . . . . . 8
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7 | 6 | imp 123 |
. . . . . . 7
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8 | ssiun2 3864 |
. . . . . . . 8
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9 | sstr2 3109 |
. . . . . . . 8
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10 | 8, 9 | syl5com 29 |
. . . . . . 7
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11 | 7, 10 | syl5 32 |
. . . . . 6
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12 | 5, 11 | rexlimi 2545 |
. . . . 5
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13 | 2, 12 | syl 14 |
. . . 4
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14 | 1, 13 | sylan2b 285 |
. . 3
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15 | 14 | ralrimiva 2508 |
. 2
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16 | dftr3 4038 |
. 2
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17 | 15, 16 | sylibr 133 |
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-ral 2422 df-rex 2423 df-v 2691 df-in 3082 df-ss 3089 df-uni 3745 df-iun 3823 df-tr 4035 |
This theorem is referenced by: truni 4048 |
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