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Mirrors > Home > ILE Home > Th. List > uniopn | Unicode version |
Description: The union of a subset of a topology (that is, the union of any family of open sets of a topology) is an open set. (Contributed by Stefan Allan, 27-Feb-2006.) |
Ref | Expression |
---|---|
uniopn |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | istopg 12205 |
. . . . 5
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2 | 1 | ibi 175 |
. . . 4
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3 | 2 | simpld 111 |
. . 3
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4 | elpw2g 4089 |
. . . . . . . 8
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5 | 4 | biimpar 295 |
. . . . . . 7
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6 | sseq1 3125 |
. . . . . . . . 9
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7 | unieq 3753 |
. . . . . . . . . 10
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8 | 7 | eleq1d 2209 |
. . . . . . . . 9
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9 | 6, 8 | imbi12d 233 |
. . . . . . . 8
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10 | 9 | spcgv 2776 |
. . . . . . 7
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11 | 5, 10 | syl 14 |
. . . . . 6
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12 | 11 | com23 78 |
. . . . 5
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13 | 12 | ex 114 |
. . . 4
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14 | 13 | pm2.43d 50 |
. . 3
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15 | 3, 14 | mpid 42 |
. 2
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16 | 15 | imp 123 |
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 ax-sep 4054 |
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-pw 3517 df-uni 3745 df-top 12204 |
This theorem is referenced by: iunopn 12208 unopn 12211 0opn 12212 topopn 12214 tgtop 12276 ntropn 12325 neipsm 12362 unimopn 12694 metrest 12714 cnopncntop 12745 |
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