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Mirrors > Home > ILE Home > Th. List > tgss2 | Unicode version |
Description: A criterion for determining whether one topology is finer than another, based on a comparison of their bases. Lemma 2.2 of [Munkres] p. 80. (Contributed by NM, 20-Jul-2006.) (Proof shortened by Mario Carneiro, 2-Sep-2015.) |
Ref | Expression |
---|---|
tgss2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | simpr 110 |
. . . . 5
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2 | uniexg 4438 |
. . . . . 6
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3 | 2 | adantr 276 |
. . . . 5
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4 | 1, 3 | eqeltrrd 2255 |
. . . 4
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5 | uniexb 4472 |
. . . 4
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6 | 4, 5 | sylibr 134 |
. . 3
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7 | tgss3 13440 |
. . 3
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8 | 6, 7 | syldan 282 |
. 2
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9 | eltg2b 13416 |
. . . . . . 7
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10 | 6, 9 | syl 14 |
. . . . . 6
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11 | elunii 3814 |
. . . . . . . . 9
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12 | 11 | ancoms 268 |
. . . . . . . 8
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13 | biimt 241 |
. . . . . . . 8
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14 | 12, 13 | syl 14 |
. . . . . . 7
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15 | 14 | ralbidva 2473 |
. . . . . 6
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16 | 10, 15 | sylan9bb 462 |
. . . . 5
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17 | ralcom3 2644 |
. . . . 5
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18 | 16, 17 | bitrdi 196 |
. . . 4
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19 | 18 | ralbidva 2473 |
. . 3
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20 | dfss3 3145 |
. . 3
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21 | ralcom 2640 |
. . 3
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22 | 19, 20, 21 | 3bitr4g 223 |
. 2
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23 | 8, 22 | bitrd 188 |
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 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-sep 4120 ax-pow 4173 ax-pr 4208 ax-un 4432 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ral 2460 df-rex 2461 df-v 2739 df-sbc 2963 df-un 3133 df-in 3135 df-ss 3142 df-pw 3577 df-sn 3598 df-pr 3599 df-op 3601 df-uni 3810 df-iun 3888 df-br 4003 df-opab 4064 df-mpt 4065 df-id 4292 df-xp 4631 df-rel 4632 df-cnv 4633 df-co 4634 df-dm 4635 df-iota 5176 df-fun 5216 df-fv 5222 df-topgen 12696 |
This theorem is referenced by: metss 13856 |
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