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| Description: The predicate "is an open set of a subspace topology". (Contributed by FL, 28-Jan-2009.) |
| Ref | Expression |
|---|---|
| issubspt |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opeq2 3159 |
. . . . . . . 8
| |
| 2 | 1 | fveq2d 4685 |
. . . . . . 7
|
| 3 | 2 | eleq2d 1964 |
. . . . . 6
|
| 4 | rexeq 2267 |
. . . . . 6
| |
| 5 | 3, 4 | bibi12d 691 |
. . . . 5
|
| 6 | 5 | imbi2d 674 |
. . . 4
|
| 7 | 6 | imbi2d 674 |
. . 3
|
| 8 | sn0top 8917 |
. . . . . 6
| |
| 9 | 8 | elimel 3025 |
. . . . 5
|
| 10 | 9 | issubsplem1 10246 |
. . . 4
|
| 11 | 10 | ex 402 |
. . 3
|
| 12 | 7, 11 | dedth 3011 |
. 2
|
| 13 | 12 | 3imp 1061 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: elsubsp 10248 subspid 10249 subcld 10254 subtopmetlem 10255 sbtpsines 14905 subtopsin2 14907 subsubtop 15423 subntr 15425 cnsubsp2 15427 compsublem 15430 compsub 15431 connsub 15443 subspopn 15837 subspabs 15840 icoopnst 15876 iocopnst 15877 cnimass 15888 cnres 15889 cnresima 15891 cnss 15892 txsubsp 15912 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-13 1311 ax-14 1312 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 ax-sep 3438 ax-nul 3445 ax-pow 3481 ax-pr 3524 ax-un 3790 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-3an 860 df-ex 1327 df-sb 1536 df-eu 1775 df-mo 1776 df-clab 1872 df-cleq 1877 df-clel 1880 df-ne 2019 df-ral 2109 df-rex 2110 df-v 2294 df-sbc 2454 df-csb 2541 df-dif 2597 df-un 2600 df-in 2603 df-ss 2605 df-nul 2876 df-if 2983 df-pw 3035 df-sn 3049 df-pr 3050 df-op 3053 df-uni 3178 df-br 3339 df-opab 3396 df-id 3586 df-xp 4000 df-rel 4001 df-cnv 4002 df-co 4003 df-dm 4004 df-rn 4005 df-res 4006 df-ima 4007 df-fun 4008 df-fv 4014 df-opr 4886 df-oprab 4887 df-top 8861 df-subsp 10243 |