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Mirrors > Home > ILE Home > Th. List > eltg4i | Unicode version |
Description: An open set in a topology generated by a basis is the union of all basic open sets contained in it. (Contributed by Stefan O'Rear, 22-Feb-2015.) |
Ref | Expression |
---|---|
eltg4i |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-topgen 11923 |
. . . . . . 7
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2 | 1 | funmpt2 5098 |
. . . . . 6
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3 | funrel 5076 |
. . . . . 6
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4 | 2, 3 | ax-mp 7 |
. . . . 5
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5 | relelfvdm 5385 |
. . . . 5
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6 | 4, 5 | mpan 418 |
. . . 4
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7 | eltg 12003 |
. . . 4
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8 | 6, 7 | syl 14 |
. . 3
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9 | 8 | ibi 175 |
. 2
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10 | inss2 3244 |
. . . . 5
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11 | 10 | unissi 3706 |
. . . 4
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12 | unipw 4077 |
. . . 4
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13 | 11, 12 | sseqtri 3081 |
. . 3
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14 | 13 | a1i 9 |
. 2
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15 | 9, 14 | eqssd 3064 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 671 ax-5 1391 ax-7 1392 ax-gen 1393 ax-ie1 1437 ax-ie2 1438 ax-8 1450 ax-10 1451 ax-11 1452 ax-i12 1453 ax-bndl 1454 ax-4 1455 ax-13 1459 ax-14 1460 ax-17 1474 ax-i9 1478 ax-ial 1482 ax-i5r 1483 ax-ext 2082 ax-sep 3986 ax-pow 4038 ax-pr 4069 ax-un 4293 |
This theorem depends on definitions: df-bi 116 df-3an 932 df-tru 1302 df-nf 1405 df-sb 1704 df-eu 1963 df-mo 1964 df-clab 2087 df-cleq 2093 df-clel 2096 df-nfc 2229 df-ral 2380 df-rex 2381 df-v 2643 df-sbc 2863 df-un 3025 df-in 3027 df-ss 3034 df-pw 3459 df-sn 3480 df-pr 3481 df-op 3483 df-uni 3684 df-br 3876 df-opab 3930 df-mpt 3931 df-id 4153 df-xp 4483 df-rel 4484 df-cnv 4485 df-co 4486 df-dm 4487 df-iota 5024 df-fun 5061 df-fv 5067 df-topgen 11923 |
This theorem is referenced by: eltg3 12008 tgdom 12023 tgidm 12025 |
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